Malicious PDF — malware analysis report

Static analysis result for SHA-256 64f4c1ddfb37fe60…

MALICIOUS

PDF

78.7 KB Created: 2020-08-03 23:29:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c3cb96ffbbc2aaf4990a78ba29b7e36 SHA-1: 27acba38dce6375adb0905fe25d77747dce67454 SHA-256: 64f4c1ddfb37fe607c78bae25304c063499a34eb4dfe1f97adaa1b6a11c7b65f
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector to a URL that appears to be used for malicious purposes, indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains text suggesting a lure for a free PDF download, aligning with a phishing or scam attempt. The presence of embedded URLs and the ML classifier's high confidence score support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://ttraff.ru/pify?keyword=biological+science+dj+taylor+pdf+free+download
    • http://files.kusummermusicfestival.com/uploads/1/3/1/6/131606291/vibuwejuw.pdf
    • http://files.napaneefamilyeyecare.ca/uploads/1/3/0/7/130740477/nemebesakidudowani.pdf
    • http://files.kilmerschool.org/uploads/1/3/0/8/130874554/fubope.pdf
    • http://files.treatsicecreamparlour.com/uploads/1/3/1/4/131437775/wanafuji.pdf
    • http://files.kathyskreationsballoonart.com/uploads/1/3/1/1/131163969/redireboxoxejuwu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/3949/7112/files/85518538181.pdf
    • https://cdn.shopify.com/s/files/1/0434/7668/0870/files/43090641573.pdf
    • https://cdn.shopify.com/s/files/1/0430/3863/8241/files/xeziloxobok.pdf
    • https://cdn.shopify.com/s/files/1/0430/0003/7527/files/kumekubiwap.pdf
    • https://cdn.shopify.com/s/files/1/0432/6811/2550/files/sijolopeluvolupadixo.pdf
    • https://cdn.shopify.com/s/files/1/0432/4560/0936/files/88709777062.pdf
    • https://cdn.shopify.com/s/files/1/0432/3619/6507/files/69817737130.pdf
    • https://cdn.shopify.com/s/files/1/0435/1734/5944/files/vupawas.pdf
    • https://cdn.shopify.com/s/files/1/0434/2058/2050/files/12451322670.pdf
    • https://cdn.shopify.com/s/files/1/0432/6542/5570/files/25025161533.pdf
    • https://cdn.shopify.com/s/files/1/0440/8904/9238/files/74275644226.pdf
    • https://cdn.shopify.com/s/files/1/0436/1597/7630/files/69655531216.pdf
    • https://cdn.shopify.com/s/files/1/0427/4801/8855/files/vetasasagipana.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3ef.bin
62704d5df246479cfd86b6b676703c6eb154243ce878f22ca70c20d9c554f184		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EF 5644 bytes
font_01_sfnt_off00010755.bin
63a2edc57450de13ac921c625488e1676ee0047bf0c898ff25e415535d2d2fd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10755 11152 bytes

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