Malicious PDF — malware analysis report

Static analysis result for SHA-256 084c63d2e428d654…

MALICIOUS

PDF

48.5 KB Created: 2020-08-21 16:10:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4cefa50fd8a9dd4812eced5d36935a5b SHA-1: fac159914a252bc727fdaf450c567559e111a3e5 SHA-256: 084c63d2e428d6543acc989f0f0f36f266efb49878a3efca2c72e126cbf4fbc6
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the same malicious URL and several other links to PDF files, suggesting a link farm or SEO poisoning tactic. 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.com/pify?keyword=rubber+sheet+manufacturers+in+ahmedabad
    • http://files.513dj.com/uploads/1/3/2/6/132695990/0149e282b21ed.pdf
    • http://lixexivad.princetonrescue-edu.com/uploads/1/3/1/4/131438759/1437cf2c6d5a5b.pdf
    • http://files.chez-fert-gite.com/uploads/1/3/2/6/132683330/viwapotikoxesajiwela.pdf
    • http://files.gladewaterathleticbearbooster.club/uploads/1/3/2/6/132681352/jizojovuna.pdf
    • http://files.marlonkellyloans.com/uploads/1/3/0/8/130874284/6965771.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0434/7707/4086/files/loxexa.pdf
    • https://cdn.shopify.com/s/files/1/0433/9816/8743/files/mathematical_statistics_lecture_notes.pdf
    • https://cdn.shopify.com/s/files/1/0429/5357/2515/files/28047495939.pdf
    • https://cdn.shopify.com/s/files/1/0434/1619/1138/files/bsc_economics_books.pdf
    • https://cdn.shopify.com/s/files/1/0434/6249/2310/files/44825044934.pdf
    • https://cdn.shopify.com/s/files/1/0431/9451/5614/files/how_to_make_a_group_on_discord.pdf
    • https://cdn.shopify.com/s/files/1/0437/0805/5720/files/simplicity_sewing_machine_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/9613/6097/files/ziraduzef.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007112.bin
6d299d579a1e5df9f1a2adb731a77ad37703d2c1d02a09376d4101c06002eb48
pdf-font-stream PDF embedded font (sfnt) at offset 0x7112 5376 bytes
font_01_sfnt_off0000832e.bin
26903caeda06636ccad6c23120d0e48f8bf3fc60f2176a49260d3cfb5a6ec173
pdf-font-stream PDF embedded font (sfnt) at offset 0x832E 10136 bytes
font_02_sfnt_off0000a5f0.bin
f4de7d80d8f780504e984ca3878d3782283c6b0c48a37ec586bc63516c3c13c7
pdf-font-stream PDF embedded font (sfnt) at offset 0xA5F0 4084 bytes