Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b291542c18fbd08…

MALICIOUS

PDF

118.0 KB Created: 2020-08-04 23:19:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b22e83c668eed3814c3017fb2d278d5 SHA-1: 2314da6c65302f8cc7b2144c4eca132c441f884b SHA-256: 2b291542c18fbd08a09618fc38d60f46d916375a1d6ef06cf4763f4fef11090c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=allan+pease+limbajul+trupului+pdf'. This URL is likely used to redirect users to a malicious site or download further malware. The document also contains a PDF link farm heuristic, indicating it's part of a larger SEO manipulation effort. The ML classifier strongly flagged this PDF as malicious.

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=allan+pease+limbajul+trupului+pdf
    • http://files.freeformdanceacademy.com/uploads/1/3/0/7/130775685/3589ab84c.pdf
    • http://files.rashadsherman.com/uploads/1/3/0/7/130739340/rexada-dotiveje-witopelo-tunibovuxa.pdf
    • http://files.preparingtostudyabroad.com/uploads/1/3/1/0/131070722/51a5d66e2e790e.pdf
    • http://nawuf.christianmusselman.com/uploads/1/3/1/6/131606165/zedirazof-gutapazuda-lerinaliromuza-pozowiwuje.pdf
    • http://files.stfrancis-sthedwig.com/uploads/1/3/0/8/130874671/takewezituri_rumavixuk_moneganafikida.pdf
    • https://cdn.shopify.com/s/files/1/0430/7052/1495/files/fesukad.pdf
    • https://cdn.shopify.com/s/files/1/0434/1393/0142/files/likibojogowajuvoluju.pdf
    • https://cdn.shopify.com/s/files/1/0433/9659/5870/files/zekanatibikorezan.pdf
    • https://cdn.shopify.com/s/files/1/0436/5352/9753/files/seruniribamax.pdf
    • https://cdn.shopify.com/s/files/1/0431/8317/7885/files/sorizesakimazuwujowimawa.pdf
    • https://cdn.shopify.com/s/files/1/0439/2294/8251/files/95931057315.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/93861148098.pdf
    • https://cdn.shopify.com/s/files/1/0434/0531/2163/files/best_heroes_for_cursed_hollow.pdf
    • https://cdn.shopify.com/s/files/1/0430/9889/8592/files/adding_decimals_quiz.pdf
    • https://cdn.shopify.com/s/files/1/0428/7306/1532/files/71170743798.pdf
    • https://cdn.shopify.com/s/files/1/0435/2291/6520/files/mafovoxaketobazuropodo.pdf
    • https://cdn.shopify.com/s/files/1/0436/4409/2566/files/fomoxav.pdf
    • https://cdn.shopify.com/s/files/1/0432/8649/5397/files/50453475210.pdf
    • https://cdn.shopify.com/s/files/1/0432/8115/4198/files/wijazatilefojovejid.pdf
    • https://cdn.shopify.com/s/files/1/0431/9323/7665/files/38616129981.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001873f.bin
588125f90b8740b07bee7db72e6ddbc7cf34e546d15ae326b1867bd9b4bb8663		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1873F 5392 bytes
font_01_sfnt_off0001997c.bin
ca802de4ad952fad8381a75a84b2d4a8085b24b5a9a1f41500b0217d1a03a6d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1997C 15836 bytes

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