Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7c391f4fabc11cc…

MALICIOUS

PDF

68.4 KB Created: 2020-12-22 02:40:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: c82e187110e70a2bb6a53bf6e7b53292 SHA-1: 2b810ae8b8e5bb481102f06d93dd1857dda4873c SHA-256: e7c391f4fabc11ccd4630d2b8e096e714d9f0a7a4469afe7fc11dcb65ebea684
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains multiple links to redirector infrastructure, specifically identified as a link farm for SEO purposes. The primary malicious link, 'https://traffmen.ru/aws?utm_term=best+android+game+making+engine', is flagged as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://traffmen.ru/aws?utm_term=best+android+game+making+engine In PDF document text
    • https://xuwosanilenerev.weebly.com/uploads/1/3/4/9/134900173/zorekadogaji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369323/normal_5faaff48c1140.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366402/normal_5f87adfb58e3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403952/normal_5f935726d14e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370560/normal_5f943e6a76af7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382208/normal_5f91b3ea416a5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe05f95147b14804f9a77a/1606288892013/22818854403.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/sejasoxotozikoxiguzuxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d520e1f-733b-49da-90fe-362be0b82d1b/jexumarofojusoz.pdfIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/mikefekonepun.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdc7d305fcdb718a17c69c1/t/5fdcee676b48d41d020b4ff1/1608314472734/tilaxe.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/inskip_point_fishing_report_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/how_to_analyze_data_in_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/crested_gecko_care_sheet_uk.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_off0000d087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD087 5224 bytes
SHA-256: 143f8aafe357aef53a0c20a4b50354880e97e433404f0f57300ab42031eb4ee5
font_01_sfnt_off0000e23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23C 10040 bytes
SHA-256: a5c37dc655bbb4d0de5409982ec3af136048f6ab500ba34ae8b6ad918c878103

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