Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fbff7a6a813b9b8…

MALICIOUS

PDF

42.8 KB Created: 2020-08-15 08:19:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd6681a61d5b37ccebee4f4c06ade3e2 SHA-1: f7bfd4d17aa659851ebb37dbb1585b5a10dcfc8b SHA-256: 2fbff7a6a813b9b83de2cf4458a5a5dcc4aec8c00dd017b4cd09dfe10b48fbcd
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector at 'ttraff.com'. The document body, though partially corrupted, includes text related to 'Temperamentos del ser humano pdf' and the malicious URL, suggesting a lure. The presence of many external links, including to Shopify domains, indicates a potential SEO poisoning or link farm strategy to distribute malicious content. No scripts were extracted, but the primary attack vector appears to be the malicious redirection links.

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/wb?keyword=temperamentos%20del%20ser%20humano%20pdf
    • http://tezupege.kevindebacker.com/uploads/1/3/2/3/132303382/namakogikoge-kifek-nidegi.pdf
    • https://cdn.shopify.com/s/files/1/0437/8555/2034/files/vekatebixonojiredi.pdf
    • https://cdn.shopify.com/s/files/1/0439/3458/0891/files/landlord_lease_template_scotland.pdf
    • https://cdn.shopify.com/s/files/1/0436/0703/1966/files/kivofi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5637/3659/files/57824917487.pdf
    • https://cdn.shopify.com/s/files/1/0433/4849/2438/files/historia_de_la_tecnologia_educativa_en_mexico.pdf
    • https://cdn.shopify.com/s/files/1/0431/8904/3358/files/lidipudotefemegod.pdf
    • https://cdn.shopify.com/s/files/1/0430/7012/8277/files/retanarezirujakiwepa.pdf
    • https://cdn.shopify.com/s/files/1/0430/3293/6605/files/bugemixuvozumagose.pdf
    • https://cdn.shopify.com/s/files/1/0431/1718/3130/files/guided_access_on_macbook_pro.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_off00005d1d.bin
b377e410e8845b59609d5f5b53b8b29d76ef9038c1dca53b7366c60e7d3b47d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D1D 5064 bytes
font_01_sfnt_off00006e1a.bin
3d995f1607a1ca2f2101c97c74d1c312465abae57665ecafb047c48b9691829b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E1A 10216 bytes
font_02_sfnt_off00008f0f.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x8F0F 4324 bytes