Malicious PDF — malware analysis report

Static analysis result for SHA-256 0327d6f6a4d50454…

MALICIOUS

PDF

48.7 KB Created: 2020-07-28 13:15:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 98713d6315df01b738628d958fb8fcc5 SHA-1: 820fb38d5881082e55f8d78b92399cbafbbdd0e8 SHA-256: 0327d6f6a4d504541afc2c3f380a09c334596d52a4ad5c5d7ab96d8e107ecb7b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to 'hot dog fundraiser flyer templates'. The presence of a large number of external PDF links, many hosted on Shopify, indicates a potential link farm or distribution network. The ML classifier also strongly flagged this PDF as malicious.

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=hot+dog+fundraiser+flyer+templates
    • http://files.daniellovesdogs22tv.com/uploads/1/3/1/4/131437535/napewukab-sazetojuv-fonokel-kujasij.pdf
    • http://files.agroproductsent.com/uploads/1/3/2/8/132814050/5a79e384d31b.pdf
    • http://files.studyaimusa.org/uploads/1/3/0/8/130874477/vitupuje.pdf
    • http://files.houseofterimicah.com/uploads/1/3/0/8/130873804/6a6c5.pdf
    • http://files.stephaniecole.co.uk/uploads/1/3/1/8/131856827/1196810.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/1030/7749/files/91098194864.pdf
    • https://cdn.shopify.com/s/files/1/0429/1959/2102/files/jazumunobijumiwufizufe.pdf
    • https://cdn.shopify.com/s/files/1/0428/0002/1667/files/65526241451.pdf
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/jotaburanubozuzuwawatudiv.pdf
    • https://cdn.shopify.com/s/files/1/0428/6464/0159/files/mojazeguf.pdf
    • https://cdn.shopify.com/s/files/1/0432/8344/7968/files/zujivemugofixu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8010/5630/files/28321816457.pdf
    • https://cdn.shopify.com/s/files/1/0429/3374/7878/files/pelirujowuzomidufu.pdf
    • https://cdn.shopify.com/s/files/1/0434/7455/0950/files/17004900452.pdf
    • https://cdn.shopify.com/s/files/1/0435/3651/5224/files/raxaradigonofi.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000076e2.bin
8fb6d0278a585f42e8405de28f7e54d82444396087ee4372dbe7b886fe44d3d2
pdf-font-stream PDF embedded font (sfnt) at offset 0x76E2 5304 bytes
font_01_sfnt_off000088e2.bin
54e6d5a05b55a71735e0abe132cb9f5645afcb9768780ea79d18feac058e7091
pdf-font-stream PDF embedded font (sfnt) at offset 0x88E2 14252 bytes