Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac32f606e82ecc8f…

MALICIOUS

PDF

92.4 KB Created: 2020-12-21 06:47:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: b9d3386edd9884be00f58fb2dd770b07 SHA-1: 98c6f2d6b473d9b959536e5b01efb068fefc1b92 SHA-256: ac32f606e82ecc8f50920d8b633102036b062e8f17900a84669ae87ca11a8a6f
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with critical heuristics identifying it as a malicious redirector and a link farm. One of the primary links directs to 'gettraff.ru', which is flagged as malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the embedded links are sufficient evidence of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • 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.
  • 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://gettraff.ru/123?utm_term=is+phenibut+legal+in+japan In PDF document text
    • https://cdn-cms.f-static.net/uploads/4420587/normal_5fab8df761fc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369664/normal_5f95d28be0e4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375890/normal_5fd3238901373.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428038/normal_5fb2bd10ac814.pdfIn PDF document text
    • https://dawemewi.weebly.com/uploads/1/3/4/7/134747996/gigofutatig.pdfIn PDF document text
    • https://madovokego.weebly.com/uploads/1/3/1/4/131409717/775a79bd3.pdfIn PDF document text
    • https://xumotisububilup.weebly.com/uploads/1/3/4/5/134591263/datakavanida.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409992/normal_5f93e59d0aa87.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/5fdf4dc4dbe48138a39a283f/t/5fdf7d03e64f5703153e133d/1608482051973/adobe_premiere_pro_cs6_direct_link.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/vaxejolon.pdfIn PDF document text
    • https://s3.amazonaws.com/xurixado/42103111675.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10867 2960 bytes
SHA-256: 4253ce374f546ed82c0b962bfad5e193173c5af7311640f7068ccdda2cb38311
font_01_sfnt_off000112e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E8 5140 bytes
SHA-256: db0aa5de321555f840508ec34c3d1d7811a458465d179f09ca52b45f912046c3
font_02_sfnt_off00012461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12461 12808 bytes
SHA-256: 1ec322d5ef72c9aaced13b981dfcd112e2b630249b68e1341b9b328e2ad3323e
font_03_sfnt_off00014ed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ED1 16160 bytes
SHA-256: f80b9f84d6ea16074f67da7a904ab41e14e5a44612b81a97f195d72f9bd2a496

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