Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a932e6a648e9d65…

MALICIOUS

PDF

41.8 KB Created: 2020-08-22 15:09:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ccc10aedc03e8d660ee045894c2655ec SHA-1: eb06edf1b6c6ed38f4dafe6e6c6de884f9629648 SHA-256: 5a932e6a648e9d65fe30be5c99ef219d4197cb86ee0e2f17b41b1fed8d33adde
154 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to a link farm designed to manipulate search engine results. One prominent link, 'https://ttraff.cc/pify?keyword=bully+game+free++for+windows+8', is identified as a malicious redirector. The document body, though partially corrupted, contains this same lure, suggesting the primary purpose is to drive traffic to malicious infrastructure.

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=bully+game+free++for+windows+8
    • http://files.nrt-ias.org/uploads/1/3/1/4/131453522/soribamirawiwug-nasajipafisuw-mozunevuxevonop-vatojujinewovi.pdf
    • http://geweja.comteachers.com/uploads/1/3/1/4/131437601/lebubudulowes.pdf
    • http://lonukilod.emergingartistgallery.com/uploads/1/3/0/8/130813710/diseveloven-lijexuvotexe-virafisaviga.pdf
    • http://vajinolux.danehillhistory.org/uploads/1/3/1/4/131406717/3851561.pdf
    • http://files.justicefarms.com/uploads/1/3/1/4/131437225/fbfb02ea27.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/1663/4016/files/7782641095.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nuruge.pdf
    • https://cdn.shopify.com/s/files/1/0432/4327/4395/files/53553060564.pdf
    • https://cdn.shopify.com/s/files/1/0431/9592/4640/files/romexupulonelavik.pdf
    • https://cdn.shopify.com/s/files/1/0438/9735/6443/files/gun_in_mouth_emoji.pdf
    • https://cdn.shopify.com/s/files/1/0430/2965/9797/files/dujusozujak.pdf
    • https://cdn.shopify.com/s/files/1/0433/4023/4917/files/biography_format.pdf
    • https://cdn.shopify.com/s/files/1/0434/7189/6736/files/concepto_de_servidor_web.pdf
    • https://cdn.shopify.com/s/files/1/0430/8392/3609/files/44653829627.pdf
    • https://cdn.shopify.com/s/files/1/0437/6746/4085/files/10740727092.pdf
    • https://cdn.shopify.com/s/files/1/0434/6370/4729/files/nephrolithiasis_diet.pdf
    • https://cdn.shopify.com/s/files/1/0434/9883/2037/files/pofomebusobujupej.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_off00006449.bin
b0bee0f981c6600bb4bff3a7a8583721ac690abfe652d9d80827148f007d5355		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6449 5664 bytes
font_01_sfnt_off00007799.bin
19b7a6aedb6a26b85bff9d10d40895f223efbc760930c6433532c66513cb9f94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7799 10232 bytes

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