Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a07ac9a0d8c76cc…

MALICIOUS

PDF

70.7 KB Created: 2021-01-12 00:09:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 80d35556bea060840ad962e6fc833c7d SHA-1: d856cd1490c822d9de14c45c5e81fd282e6f4040 SHA-256: 4a07ac9a0d8c76ccb01844f0c2c8dd27ef0557ad1110c6ef8dd68c21df5f453f
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains heuristics indicating it is a malicious redirector, specifically designed to lure users with a 'free printable envelope template' lure. The primary malicious URL, https://cctraff.ru/aws?utm_term=free+printable+envelope+template, is identified as a redirector to malicious infrastructure. While no scripts were explicitly extracted, the PDF structure and the nature of the redirector suggest an attempt to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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.
  • 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://cctraff.ru/aws?utm_term=free+printable+envelope+template In PDF document text
    • https://static.s123-cdn-static.com/uploads/4500670/normal_5fdeb3bfa1992.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/xetakoxejikabuz.pdfIn PDF document text
    • https://site-1177548.mozfiles.com/files/1177548/respawnables_online_pvp_battles_mod_apk.pdfIn PDF document text
    • https://site-1174507.mozfiles.com/files/1174507/4_pics_1_word_4_letters_answers_leaf.pdfIn PDF document text
    • https://site-1166610.mozfiles.com/files/1166610/duzajifogugi.pdfIn PDF document text
    • https://junobinedutuki.weebly.com/uploads/1/3/2/7/132712306/124622.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/suzeduselu/little_tikes_picnic_table.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/dudixerapinex.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/78521765783.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/25581883791.pdfIn PDF document text
    • https://s3.amazonaws.com/wusigipufuvowix/car_gauge_pro_app.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D1 4940 bytes
SHA-256: f1aeef9bd34a764cc5aefe53a1492f893abb61ba5e60ac26414aba9e435554f8
font_01_sfnt_off0000e990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE990 10688 bytes
SHA-256: 55bf952523695450ad42a55a9c6487009bbe630c7f134a7b7e06686d117f4bca

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