Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4c78471bb51c2ff…

MALICIOUS

PDF

124.6 KB Created: 2020-08-13 15:31:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd5496708aa1976148073f02b182070c SHA-1: bf53b034357a56fa6c92576f0e98a089b90ffcda SHA-256: b4c78471bb51c2ff3a149465ac12a07b0562b059370b90013bbd9d4373a3a16a
152 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=alter+ego+2+plus+pdf+gratis'. Additionally, it exhibits a PDF link farm with 30 external links, many hosted on cdn.shopify.com, suggesting an attempt to distribute malicious content or engage in SEO manipulation for malicious purposes. The ML classifier also 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=alter+ego+2+plus+pdf+gratis
    • http://vanopaja.rogergrimleyomnibus.com/uploads/1/3/1/6/131606255/vibaz_ruvejiwajex_bumusame_fotad.pdf
    • http://koteseta.icareunited.org/uploads/1/3/1/0/131070374/7263131.pdf
    • http://files.omanroadshow.com/uploads/1/3/0/7/130776841/kasulojemuv.pdf
    • http://files.silvestriphotography.com/uploads/1/3/0/8/130814411/7405325.pdf
    • http://files.benniesbarnantiquemall.com/uploads/1/3/1/4/131437532/fimona.pdf
    • https://cdn.shopify.com/s/files/1/0430/5823/3493/files/ball_bearing_nomenclature.pdf
    • https://cdn.shopify.com/s/files/1/0435/4323/2661/files/axar_publication_english_grammar_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/7778/0134/files/somijadok.pdf
    • https://cdn.shopify.com/s/files/1/0431/3628/6877/files/tukiwosazumonojobinupa.pdf
    • https://cdn.shopify.com/s/files/1/0437/7939/1646/files/6143453087.pdf
    • https://cdn.shopify.com/s/files/1/0431/7465/8216/files/bebusadefogivekur.pdf
    • https://cdn.shopify.com/s/files/1/0435/4329/8207/files/bujema.pdf
    • https://cdn.shopify.com/s/files/1/0434/2992/0930/files/21493427011.pdf
    • https://cdn.shopify.com/s/files/1/0428/1057/2966/files/96348165284.pdf
    • https://cdn.shopify.com/s/files/1/0433/6127/1959/files/azulfin_500mg_bula.pdf
    • https://cdn.shopify.com/s/files/1/0433/0458/3318/files/xonoxuwo.pdf
    • https://cdn.shopify.com/s/files/1/0428/7237/3414/files/dazululegodexutewisupaz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001903b.bin
4f94539acaf079e6167c24067e0cac6b940803d4770572f7585649dffdb9ab88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1903B 5328 bytes
font_01_sfnt_off0001a26e.bin
cd39b8db8d2be84e22318c6db776275e2d021c215b2de5c41405d89e220db816		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A26E 14112 bytes
font_02_sfnt_off0001cf1e.bin
cbdbfe760b4a5610a5c6cdae2de6bcd38aba6314ce4962aa9665e81d84448a33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CF1E 16220 bytes

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