Malicious PDF — malware analysis report

Static analysis result for SHA-256 15f3fcd904ed6f17…

MALICIOUS

PDF

45.3 KB Created: 2020-08-08 02:24:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa88cab7a6a64851e5a50c54e93bbcb6 SHA-1: 724e44b9abe926f5033ce449a8957575c5f40eb9 SHA-256: 15f3fcd904ed6f17227a728cd7d8dd88c6727ac178d24b55a46cfcba68310271
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that redirect to a malicious URL, disguised as a "Vce to pdf converter online". The ML classifier strongly indicated maliciousness, and the document body itself contains the malicious URL. The presence of numerous external links suggests a link farm or SEO poisoning tactic to distribute the malicious 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.ru/pify?keyword=vce+to+pdf+converter+online
    • http://files.claycountyhistoricalsocietyin.org/uploads/1/3/1/3/131380251/sivugeg.pdf
    • http://files.mutianyugreatwalltours.com/uploads/1/3/1/4/131407194/1041215.pdf
    • http://files.alimccann.net/uploads/1/3/0/7/130775921/398c4a6b4.pdf
    • http://files.littlepicassobaltimore.com/uploads/1/3/2/7/132740525/3666971.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/5269/3654/files/zivadifibeperoratifikak.pdf
    • https://cdn.shopify.com/s/files/1/0428/7502/7619/files/lesosemikebanasexon.pdf
    • https://cdn.shopify.com/s/files/1/0432/3583/6063/files/factorio_bus_balancer.pdf
    • https://cdn.shopify.com/s/files/1/0438/9958/4664/files/43963467745.pdf
    • https://cdn.shopify.com/s/files/1/0434/0455/8488/files/85538354692.pdf
    • https://cdn.shopify.com/s/files/1/0430/1769/9477/files/88405053030.pdf
    • https://cdn.shopify.com/s/files/1/0434/8664/2336/files/coupled_cfd_dem_modeling.pdf
    • https://cdn.shopify.com/s/files/1/0427/8845/4559/files/girikirisavuzoni.pdf
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/67961490177.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32150460784.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_off00006d07.bin
d9635b81180ed36d680ab89ff541841b96e24ea378ef52ce1bc57bf51a9abe02
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D07 4784 bytes
font_01_sfnt_off00007d6e.bin
24e54c9137920d22991d93f9a2d84ddfcc35ebf7f8dcbaa6ccc089cb0507cd4f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D6E 13620 bytes