Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ce8cf0e033f7c1b…

MALICIOUS

PDF

40.8 KB Created: 2020-08-05 05:42:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 51c7d29084b1f6657c89627f63ae0634 SHA-1: 0e1429050ea911a7a8000dfe82bdf85deb3d1393 SHA-256: 5ce8cf0e033f7c1bd11530f8025e4beb5ac5cb937d62a0763e7f66692fae6b35
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting an SEO link farm or a method to obscure malicious redirects. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=braiding+sweetgrass+kimmerer+pdf'. The document body, though heavily obfuscated, also contains this URL and other Shopify links, likely intended to appear legitimate. The ML classifier strongly indicated maliciousness.

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=braiding+sweetgrass+kimmerer+pdf
    • http://files.sweetdreamsweddingflowers.com/uploads/1/3/1/6/131606186/58356f3725.pdf
    • http://files.letschoosejoy.com/uploads/1/3/1/3/131384429/zajikovotoj.pdf
    • http://files.nwaw.com/uploads/1/3/0/8/130814283/102cc33931bc.pdf
    • http://files.skylineelectricalmn.com/uploads/1/3/0/9/130970009/denojukewuf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/0555/8436/files/8731262420.pdf
    • https://cdn.shopify.com/s/files/1/0433/1926/3397/files/35067290340.pdf
    • https://cdn.shopify.com/s/files/1/0431/7750/9020/files/kugar.pdf
    • https://cdn.shopify.com/s/files/1/0428/2603/9452/files/7889541826.pdf
    • https://cdn.shopify.com/s/files/1/0429/7952/4759/files/muzixud.pdf
    • https://cdn.shopify.com/s/files/1/0430/0436/2906/files/13461611575.pdf
    • https://cdn.shopify.com/s/files/1/0428/8688/9625/files/patidiwaxirafa.pdf
    • https://cdn.shopify.com/s/files/1/0432/4176/7072/files/54853958034.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vibemegabixowosepabotabux.pdf
    • https://cdn.shopify.com/s/files/1/0436/1856/6306/files/9335598239.pdf
    • https://cdn.shopify.com/s/files/1/0448/4648/1570/files/minecraft_1._13._2_forge.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6965/files/tuduxoweve.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_off00006219.bin
85bbbc2450c5556bc8238976322e39c59d48a51a0c8f5f83c5ed713a95719362		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6219 5536 bytes
font_01_sfnt_off000074f3.bin
258ed639db7f4cff2ebc7da1bafbc0fac1b0b2a3b0ac6d61bc35a2c964313dc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74F3 9788 bytes

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