Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb0cbd63c926aaaf…

MALICIOUS

PDF

82.8 KB Created: 2021-05-26 16:29:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: f5c90c9f9c6ecfc1e1354848ef9172a1 SHA-1: e2d86864ae467d044c96c6a663fffbb575bf3123 SHA-256: fb0cbd63c926aaaf82af8e1dc9cc665562009f02b7a41a30fbc6633508d1d5b0
262 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a critical heuristic firing for a malicious redirector link, specifically pointing to a URL designed to lure users with the promise of 'candy crush mod apk unlimited money'. This, combined with other heuristics indicating a link farm and a ML classifier flagging it as malicious, strongly suggests a phishing or potentially unwanted software distribution scheme. Although no scripts were extracted, the presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect the user to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dafemum.ru/strik?utm_term=candy+crush+mod+apk+unlimited+money In PDF document text
    • https://cdn-cms.f-static.net/uploads/4498992/normal_601b1b14e3054.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4528780/normal_6010108d80dbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406241/normal_605a0a630abb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448750/normal_601ae2de5152d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460048/normal_5fc8d159e1245.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418367/normal_5ff10f8b809f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416490/normal_5fe4f4347c983.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495685/normal_60102c0af074d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471704/normal_6049a3b27905e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369512/normal_602f39c977c3b.pdfIn PDF document text
    • https://wururozudarorar.weebly.com/uploads/1/3/1/3/131380521/regawatazada.pdfIn PDF document text
    • https://pitisugokusibim.weebly.com/uploads/1/3/4/4/134445344/f82e88aedb98a.pdfIn PDF document text
    • https://forugizatufuru.weebly.com/uploads/1/3/1/4/131410167/gozudajol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455639/normal_604ccda1d0d77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416810/normal_60307f6d0a220.pdfIn PDF document text
    • https://pabametutib.weebly.com/uploads/1/3/5/3/135317572/814cba7927f5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/792b560d-44ef-449c-a2d4-aaf6c3a85bb3/what_does_rag_doll_someone_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e6b472a-9bb1-4764-b656-479ba71cd536/best_picture_settings_for_samsung_uhd_tv_series_8.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddec7850-8ee2-4498-92d6-614cb1f71058/romeo_and_juliet_characters_quizlet.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EB 5384 bytes
SHA-256: 4eb13ad55848c0599883b8202b642ab08ac327fc744f9c5c5fc3b8f182c03c26
font_01_sfnt_off00010413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10413 10656 bytes
SHA-256: 8d66c641147c2278c07644b717c6dbb74bccb65cda8767c15da28bb936c1e719
font_02_sfnt_off000128c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C8 16136 bytes
SHA-256: b87dc9cf3f55aeef5ecd96a4f5a0c8a661d1f6fea33ffedf98a3be0636a851a5

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