Malicious PDF — malware analysis report

Static analysis result for SHA-256 8262095154ac22c9…

MALICIOUS

PDF

45.1 KB Created: 2020-08-01 17:19:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be1afc5f2b884289582403f23f4cce5a SHA-1: 8b7b93a30051ee9ae3cbe4df13e599929f37446f SHA-256: 8262095154ac22c90bb3c80780d538843618436ed655d9d84853dd0f4f282862
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with a critical heuristic firing indicating it points to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches the redirector heuristic. This suggests the primary purpose is to redirect users to malicious sites, potentially for phishing or malware distribution.

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.cc/pify?keyword=c+append+int+to+string
    • http://files.themuaythaimuppets.com/uploads/1/3/1/8/131856624/funedafepame.pdf
    • http://files.patchworkstories.net/uploads/1/3/0/8/130874634/32b60.pdf
    • http://files.mrsalvarezclass.org/uploads/1/3/0/8/130813111/madosesosesa_tujufur.pdf
    • http://files.thereserittenbach.com/uploads/1/3/1/6/131606353/tofopidam.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6191/1458/files/54049300209.pdf
    • https://cdn.shopify.com/s/files/1/0433/7542/7735/files/palumuxiwige.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/neretidesalefadim.pdf
    • https://cdn.shopify.com/s/files/1/0431/9241/8468/files/luwef.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/libutufisolefod.pdf
    • https://cdn.shopify.com/s/files/1/0431/6997/2384/files/46653302130.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kiwovanigefuminif.pdf
    • https://cdn.shopify.com/s/files/1/0436/3167/3502/files/sesadepadexudinuside.pdf
    • https://cdn.shopify.com/s/files/1/0429/8221/1735/files/rojuwuwurugajixew.pdf
    • https://cdn.shopify.com/s/files/1/0430/3493/5447/files/28792791014.pdf
    • https://cdn.shopify.com/s/files/1/0428/2925/0719/files/gafibaxafor.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/42479515564.pdf
    • https://cdn.shopify.com/s/files/1/0432/6991/4782/files/76352913219.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_off000066cc.bin
c25b02bd982dd3d7b0a0a57826a9bcc6b39a1d459f29abc7be30dd2d65658d43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66CC 5000 bytes
font_01_sfnt_off000077d4.bin
c969ae5562fe048c41c4656cfb30aacaefe46c03639d4fc798530aaad4e23193		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77D4 15452 bytes

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