Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f8e4d6fb9bd4791…

MALICIOUS

PDF

40.7 KB Created: 2020-08-05 23:06:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f9bcec341a9a20b57addedac7ad1cb0 SHA-1: 1a51f68235c4ccf7499ab87eb6f881bdfdbb86b0 SHA-256: 5f8e4d6fb9bd47912e945a9413dd775c727c5e5827976be32e9588c8011e4fad
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a lure for an 'aptitude test' which redirects to a malicious URL. This is supported by heuristics indicating a malicious redirector link and a link farm, suggesting an attempt to drive traffic to malicious sites. The ML classifier also 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.cc/pify?keyword=aptitude+test+for+freshers+with+answers+pdf+download
    • http://files.triplechomestead.net/uploads/1/3/0/7/130739379/fizijugel.pdf
    • http://files.jandrexler.com/uploads/1/3/1/3/131380083/649d34cf463.pdf
    • http://govobosa.radicleelements.ca/uploads/1/3/0/8/130814124/87d1c96e.pdf
    • http://files.americanmadeexotics.com/uploads/1/3/1/3/131384400/7165702.pdf
    • http://files.bigsandlakepoa.org/uploads/1/3/2/6/132680874/denara.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6558/1468/files/bimunajamovuzuviforejoxav.pdf
    • https://cdn.shopify.com/s/files/1/0432/7967/9646/files/dowitokuvemozefuzejob.pdf
    • https://cdn.shopify.com/s/files/1/0440/8606/7352/files/tiganosivixifimematodom.pdf
    • https://cdn.shopify.com/s/files/1/0437/5475/0106/files/kidimakizofibanigejaxar.pdf
    • https://cdn.shopify.com/s/files/1/0438/0744/1053/files/xuxurufimejaru.pdf
    • https://cdn.shopify.com/s/files/1/0428/7306/1532/files/94864236108.pdf
    • https://cdn.shopify.com/s/files/1/0436/9770/1032/files/jemibeborinugujejuma.pdf
    • https://cdn.shopify.com/s/files/1/0438/9902/7611/files/55609580654.pdf
    • https://cdn.shopify.com/s/files/1/0437/6179/5230/files/81691050315.pdf
    • https://cdn.shopify.com/s/files/1/0439/2599/5688/files/volkswagen_beetle_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/4392/1820/files/45517044450.pdf
    • https://cdn.shopify.com/s/files/1/0437/6743/1320/files/moborizer.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_off000060eb.bin
5fdaf51aa08ee48ade994d6944a230b5bd54f14574dd0907b840e2f2927870ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x60EB 5208 bytes
font_01_sfnt_off000072b3.bin
57578f2ceeefeb884b9239ac2baa3868f1e366e88725c1601515f48dc1bc6972
pdf-font-stream PDF embedded font (sfnt) at offset 0x72B3 10200 bytes