Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f6cdee5137ec094…

MALICIOUS

PDF

41.8 KB Created: 2020-08-08 10:29:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c2e40c8901d5f55f5f593c88a9c2a8d8 SHA-1: e8a2f45b3b694a8221b0fd718f6fcc5af997cb51 SHA-256: 1f6cdee5137ec094e1ca8364da4b2bd37129a935e8c0618140bb36faf1af1d6a
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to Shopify-hosted PDFs, designed to appear as legitimate search results. The primary malicious link, https://ttraff.com/pify?keyword=ak+datta+anatomy+thorax+and+abdomen+pdf, is a redirector to potentially malicious content. The document body itself is heavily obfuscated but contains references to the malicious URL and other PDF files, suggesting a link farm or SEO poisoning attack. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=ak+datta+anatomy+thorax+and+abdomen+pdf
    • http://files.alpacacentral.ca/uploads/1/3/0/7/130740563/sesegotaxogudiva.pdf
    • http://files.gnshs-pto.org/uploads/1/3/1/8/131856392/zovoderarala.pdf
    • http://files.jennyscreativeedge.com/uploads/1/3/0/9/130969061/acedd.pdf
    • http://monut.seminolecemeteryassociation.com/uploads/1/3/0/7/130775350/ab7fd143d.pdf
    • https://cdn.shopify.com/s/files/1/0438/2585/6669/files/niwiwedapetujune.pdf
    • https://cdn.shopify.com/s/files/1/0435/8465/1423/files/canon_mx492_manual.pdf
    • https://cdn.shopify.com/s/files/1/0447/7183/6055/files/artritis_reumatoide_juvenil_fisioterapia.pdf
    • https://cdn.shopify.com/s/files/1/0428/9586/8067/files/68680607085.pdf
    • https://cdn.shopify.com/s/files/1/0431/1633/1172/files/27582405220.pdf
    • https://cdn.shopify.com/s/files/1/0428/9573/6988/files/repurezoferikudufofox.pdf
    • https://cdn.shopify.com/s/files/1/0454/4820/0342/files/assistive_technology_for_autism.pdf
    • https://cdn.shopify.com/s/files/1/0445/8535/3380/files/princeton_review_cracking_the_new_sat.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3098/files/alimak_raise_climber.pdf
    • https://cdn.shopify.com/s/files/1/0435/8209/5517/files/jurisprudence_exam_texas.pdf
    • https://cdn.shopify.com/s/files/1/0431/4556/0219/files/gibavuzunazidivezotejopup.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004382.bin
c6e39f0f1879cc4fd4af34a475e1400c8da9d56468b2f4d581e89216b04e9a5e
pdf-font-stream PDF embedded font (sfnt) at offset 0x4382 5176 bytes
font_01_sfnt_off000054f3.bin
d7398f69a64544a37d87d89e1ba0aff97d83623d646bb127637aa4e6da0f2a4c
pdf-font-stream PDF embedded font (sfnt) at offset 0x54F3 9316 bytes
font_02_sfnt_off000074f7.bin
e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6
pdf-font-stream PDF embedded font (sfnt) at offset 0x74F7 16164 bytes
font_03_sfnt_off00008a0e.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x8A0E 4324 bytes