Malicious PDF — malware analysis report

Static analysis result for SHA-256 cba0405656912a05…

MALICIOUS

PDF

46.0 KB Created: 2020-08-09 11:30:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9a0290e58af9bed44bc3627799aa4cf SHA-1: eb69b0418bdfd9796701695dcaf0885369cfbeb2 SHA-256: cba0405656912a0592a3667252c9569bdac24922f4d639ee11d2381169cb448b
152 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous embedded URLs, many pointing to Shopify domains, but one critical URL redirects to a known malicious domain. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be a social engineering lure, directing users to a malicious redirector disguised as a PDF download. No scripts were extracted from this sample.

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=cause+and+effect+analysis+pdf
    • http://xanejidub.jesusexplored.org/uploads/1/3/1/0/131070786/1278027.pdf
    • http://pifekowiz.kissthefrog.ca/uploads/1/3/2/8/132814930/kuxiku-paxexulusop-sinomegadeg-lemona.pdf
    • http://files.canadaparkour.com/uploads/1/3/1/8/131871729/tijiliwe.pdf
    • http://files.vickylneal.com/uploads/1/3/0/8/130813055/rofumam.pdf
    • https://cdn.shopify.com/s/files/1/0430/4135/7977/files/texas_rental_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/39843759369.pdf
    • https://cdn.shopify.com/s/files/1/0428/6621/3031/files/candida_bucal_tratamiento.pdf
    • https://cdn.shopify.com/s/files/1/0431/6299/2799/files/77455015477.pdf
    • https://cdn.shopify.com/s/files/1/0431/7865/5903/files/ribad.pdf
    • https://cdn.shopify.com/s/files/1/0429/8624/2209/files/panezisuwewudosinogo.pdf
    • https://cdn.shopify.com/s/files/1/0430/6219/8425/files/xilagesufuzuwelifiwa.pdf
    • https://cdn.shopify.com/s/files/1/0431/3058/5239/files/58482839830.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/31600860792.pdf
    • https://cdn.shopify.com/s/files/1/0432/9403/2040/files/moxowifa.pdf
    • https://cdn.shopify.com/s/files/1/0435/4277/3914/files/37572763057.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006964.bin
f41e66e79127f5e0262e48485ac2661048fbecbe2e496fe542c22549b6d37a18
pdf-font-stream PDF embedded font (sfnt) at offset 0x6964 4952 bytes
font_01_sfnt_off00007a5c.bin
cd1e983e6f83a5236798682e01ef4d97230bc9517afa8cf405a36abd0856121a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A5C 10112 bytes
font_02_sfnt_off00009cef.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x9CEF 4324 bytes