Malicious PDF — malware analysis report

Static analysis result for SHA-256 683ee2d30bd65637…

MALICIOUS

PDF

45.3 KB Created: 2020-08-20 05:54:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2255be2bf3a00d868e5fc04c06a9c05c SHA-1: 0165dc7c7df456eca9a19b0126e215c66577d821 SHA-256: 683ee2d30bd65637795e8b50a989ecf5ed779d1a42b9fb34c7a326b2641288f5
154 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs. One URL, 'https://ttraff.ru/pify?keyword=vdp+system+full+form', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and URLs, suggesting an attempt to disguise malicious content or redirect users to external sites for further exploitation.

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=vdp+system+full+form
    • http://toruxu.sfxfaithformation.org/uploads/1/3/0/8/130813765/67e16ec74da.pdf
    • http://files.mvbands.org/uploads/1/3/1/3/131378993/galebabipogagewefil.pdf
    • http://files.franciscanyon.com/uploads/1/3/1/4/131408103/wutidemufewoses-wijirozifawa-pemos-gavofax.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/0441/8455/files/bloodborne_dungeon_trophy_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/7772/9432/files/wogapobigir.pdf
    • https://cdn.shopify.com/s/files/1/0431/6902/2109/files/61631592030.pdf
    • https://cdn.shopify.com/s/files/1/0431/3851/5098/files/79920120904.pdf
    • https://cdn.shopify.com/s/files/1/0431/9998/7873/files/80051799698.pdf
    • https://cdn.shopify.com/s/files/1/0433/5340/7646/files/81359266755.pdf
    • https://cdn.shopify.com/s/files/1/0432/6886/6208/files/2018_school_calendar_south_africa.pdf
    • https://cdn.shopify.com/s/files/1/0435/9330/2178/files/approaches_to_risk_management.pdf
    • https://cdn.shopify.com/s/files/1/0433/1785/4366/files/bemef.pdf
    • https://cdn.shopify.com/s/files/1/0434/7727/0692/files/resalunapemuxerezawoveb.pdf
    • https://cdn.shopify.com/s/files/1/0434/6540/8662/files/74790317614.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_off000073a4.bin
5035344a7252e2b44f1997da8da0af96bf4523fece1b0c6ef88ec6e75a205370
pdf-font-stream PDF embedded font (sfnt) at offset 0x73A4 5044 bytes
font_01_sfnt_off000084cb.bin
faece6bf98b6e17ca6731f82fb6e886880fe0029f388637529ee99a769eb29b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x84CB 10336 bytes