Malicious PDF — malware analysis report

Static analysis result for SHA-256 844847406bd01c65…

MALICIOUS

PDF

42.7 KB Created: 2020-08-22 19:56:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 74a8b35e50b31400418a7040927d66aa SHA-1: a854dfeb5adf8d0e4deddd9b51b8458ba874f24d SHA-256: 844847406bd01c651fc1ef9269dc931c94132ee6ebec8c26100c5754a09518e5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting PDF files, but one critical link redirects to a known malicious infrastructure. This suggests a link farm or SEO poisoning tactic designed to lure users to potentially harmful content. The ML classifier strongly supports the malicious nature of this PDF.

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=purpose+driven+life+journal+free
    • http://zafake.bettereatingcoach.com/uploads/1/3/1/4/131438477/damutozigiba-kukuno.pdf
    • http://xufadozi.uccellos.com/uploads/1/3/2/8/132814930/nipuwozovixinifad.pdf
    • http://xodexamu.ladyannestrunkomaha.com/uploads/1/3/0/7/130775350/kotepanigumubelafu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vuxopikuxoxixu.pdf
    • https://cdn.shopify.com/s/files/1/0438/1887/7085/files/embryologie_de_l_appareil_gnital_fminin.pdf
    • https://cdn.shopify.com/s/files/1/0437/6972/5080/files/13128132268.pdf
    • https://cdn.shopify.com/s/files/1/0438/3621/1357/files/risenuwowadoveki.pdf
    • https://cdn.shopify.com/s/files/1/0437/6189/3534/files/prefixes_suffixes_worksheet_exercises_answers.pdf
    • https://cdn.shopify.com/s/files/1/0428/4828/8934/files/virufirakoko.pdf
    • https://cdn.shopify.com/s/files/1/0434/3139/5493/files/kawopasinejevoz.pdf
    • https://cdn.shopify.com/s/files/1/0434/1055/5047/files/12137120859.pdf
    • https://cdn.shopify.com/s/files/1/0435/8311/1336/files/geladeira_brastemp_ative_manual.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_off0000678a.bin
b2ef61bee469d4dcef16059fc0bb0c875e58e15bcfb26e4de6716206379434fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x678A 5172 bytes
font_01_sfnt_off0000793a.bin
c0e11f106b0b729057b1229a8152dfc89124a97a6a86d0d881f0f32b9490fdfc
pdf-font-stream PDF embedded font (sfnt) at offset 0x793A 10400 bytes