Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6099a3601d1dd75…

MALICIOUS

PDF

41.1 KB Created: 2020-08-08 03:30:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9dfa7addae7dfae1970455decd4d894 SHA-1: 0820ae6334816436e1bd30c162b686039261a276 SHA-256: a6099a3601d1dd75f3d45c125661266315176851893605fa1667e0c2e0d7009f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/pify?keyword=biodiesel+business+plan+pdf'. This URL is presented within the document body, suggesting a social engineering lure. The presence of a large number of external PDF links, many hosted on Shopify, further indicates a link farm or SEO poisoning attempt to drive traffic to malicious sites. No scripts were extracted, but the primary attack vector appears to be the malicious redirector.

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=biodiesel+business+plan+pdf
    • http://gaxij.alexandriafamilymartialarts.com/uploads/1/3/0/8/130813612/dewogon.pdf
    • http://files.vertimu-biurasvilniuje.eu/uploads/1/3/0/9/130969306/8348306.pdf
    • http://files.lafemmestyling.com/uploads/1/3/1/1/131163590/429caab270eac2c.pdf
    • http://files.jollygoods.shop/uploads/1/3/1/6/131606035/3d3982ab2eea0.pdf
    • https://cdn.shopify.com/s/files/1/0430/2418/7549/files/fukefodavajiximak.pdf
    • https://cdn.shopify.com/s/files/1/0430/5285/9543/files/jedotamodixixujowuxefov.pdf
    • https://cdn.shopify.com/s/files/1/0428/9203/4211/files/tijaxu.pdf
    • https://cdn.shopify.com/s/files/1/0433/3607/3366/files/47931577465.pdf
    • https://cdn.shopify.com/s/files/1/0431/6676/1120/files/xolenunimugovafutamame.pdf
    • https://cdn.shopify.com/s/files/1/0428/8151/5673/files/sistem_kepartaian_amerika_serikat.pdf
    • https://cdn.shopify.com/s/files/1/0428/9291/8937/files/cidco_lottery_2020_result.pdf
    • https://cdn.shopify.com/s/files/1/0430/1042/4993/files/susatu.pdf
    • https://cdn.shopify.com/s/files/1/0434/2710/2876/files/free_bible_studies_for_couples_dating.pdf
    • https://cdn.shopify.com/s/files/1/0430/2081/2441/files/77525135158.pdf
    • https://cdn.shopify.com/s/files/1/0433/9941/3925/files/fallout_76_character_builder.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000623c.bin
be01164ab078699e0b3ffc8316d1cdf0a0840d79b2e24d9d31d6ac9edd27cb7d
pdf-font-stream PDF embedded font (sfnt) at offset 0x623C 5128 bytes
font_01_sfnt_off000073bb.bin
0853fab7b67ef15e3fb9723d358e95bac8192eaddfa7d07d4568e2e78ea7de45
pdf-font-stream PDF embedded font (sfnt) at offset 0x73BB 10596 bytes