Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fac6016d62c4c7e…

MALICIOUS

PDF

53.9 KB Created: 2020-08-19 18:41:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5ffb55a0aff1320f2dd2a4336d4bf405 SHA-1: 212fdbad7f8261dad66c05ebf4c61f833bcda543 SHA-256: 5fac6016d62c4c7ee01db1296d670417ef2e38bfdd33a736e809d2a274de9ff2
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, and a large number of external PDF links, suggesting a link farm for SEO manipulation or malware distribution. The document body contains a URL that appears to be the same as the malicious redirector, further supporting the attack pattern. No scripts were extracted from this sample.

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=residential+construction+schedule+template+excel+free
    • http://files.pacehighchoir.com/uploads/1/3/1/8/131871891/2056809.pdf
    • http://kepurelu.nonswimmingfish.com/uploads/1/3/2/8/132814930/rutusuzas-kuguselod-nixalo.pdf
    • http://gakosu.twistedbeaverriveradventures.com/uploads/1/3/0/8/130813306/5567514.pdf
    • http://dabib.thewondercompass.com/uploads/1/3/1/4/131438809/sukewose_lefurasimun_nojedoku.pdf
    • http://files.francescobarone.com/uploads/1/3/1/4/131483266/redegolavakan-gufonili.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/9822/5320/files/55053947994.pdf
    • https://cdn.shopify.com/s/files/1/0435/5306/3063/files/gta_dsn_codes.pdf
    • https://cdn.shopify.com/s/files/1/0432/0496/8603/files/5375370570.pdf
    • https://cdn.shopify.com/s/files/1/0432/1515/9458/files/99741180265.pdf
    • https://cdn.shopify.com/s/files/1/0437/9593/9488/files/embriologia_aparato_reproductor_femenino.pdf
    • https://cdn.shopify.com/s/files/1/0431/9199/2481/files/bank_clerk_syllabus_2020.pdf
    • https://cdn.shopify.com/s/files/1/0430/4555/2277/files/31404310950.pdf
    • https://cdn.shopify.com/s/files/1/0431/0230/6468/files/google_analytics_android_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0432/2089/3864/files/butigutim.pdf
    • https://cdn.shopify.com/s/files/1/0429/7100/5082/files/66644384831.pdf
    • https://cdn.shopify.com/s/files/1/0432/3803/1518/files/xageradasidusesasad.pdf
    • https://cdn.shopify.com/s/files/1/0432/3262/4808/files/48075655987.pdf
    • https://cdn.shopify.com/s/files/1/0430/2598/9785/files/29880926689.pdf
    • https://cdn.shopify.com/s/files/1/0435/5109/6984/files/vesudikadamomulukadod.pdf
    • https://cdn.shopify.com/s/files/1/0437/6661/2130/files/74400440132.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_off00009581.bin
3a3f8c427b32234fbdf54a70e8125482f60466230d70901e0b54af8c7a1f91b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9581 5468 bytes
font_01_sfnt_off0000a7f2.bin
f7eaf894c8c7cee2a10d8f17f97acb48582d9fd361a7b4e14ddaa18ea8b3b800		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7F2 9852 bytes

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