Malicious PDF — malware analysis report

Static analysis result for SHA-256 416f170853b0cf47…

MALICIOUS

PDF

37.2 KB Created: 2020-08-12 07:10:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed30af010598d9465858541c4147d35c SHA-1: cd18cb4bd4f692c6a2a01f554b58dc587a811608 SHA-256: 416f170853b0cf471c7f0b8cab29e08a909f0c53c33d2fb4c075a764436efe6c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains embedded links, one of which, 'https://ttraff.cc/wb?keyword=harrison's%20self%20assessment%20and%20board%20review%2020th%20edition%20pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and numerous other links pointing to Shopify domains, suggesting a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier 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.cc/wb?keyword=harrison
    • http://vikuvux.patanjali-yoga.info/uploads/1/3/0/7/130739625/tusufil_lulalapamu.pdf
    • http://dalos.nurturingsprouts.com/uploads/1/3/1/4/131438079/sewufi_nelisokuvil_lixevus_sijoruvimezikup.pdf
    • http://files.havenartistry.com/uploads/1/3/1/8/131871852/af9914e003e.pdf
    • https://cdn.shopify.com/s/files/1/0433/1431/5422/files/lixozazuwofuledu.pdf
    • https://cdn.shopify.com/s/files/1/0437/6693/9799/files/ketipopekupuzono.pdf
    • https://cdn.shopify.com/s/files/1/0431/1826/4469/files/679352823.pdf
    • https://cdn.shopify.com/s/files/1/0433/2696/3865/files/catalogo_moldes_cadweld_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0437/1133/2503/files/ageless_body_timeless_mind_book.pdf
    • https://cdn.shopify.com/s/files/1/0435/3998/8648/files/jeposibekijo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8914/9608/files/pojikudidot.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/92161478626.pdf
    • https://cdn.shopify.com/s/files/1/0432/0470/6464/files/4494130107.pdf
    • https://cdn.shopify.com/s/files/1/0430/6350/9141/files/gokosumowalolesuremi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sasukeseduvemuledup.pdf
    • https://cdn.shopify.com/s/files/1/0433/6310/6968/files/assignment_abroad_times_newspaper_jobs.pdf
    • https://cdn.shopify.com/s/files/1/0434/5361/2182/files/multi_domain_ssl_apache.pdf
    • https://cdn.shopify.com/s/files/1/0429/8611/1137/files/bodokeli.pdf
    • https://cdn.shopify.com/s/files/1/0437/5435/6897/files/6950221545.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f71.bin
5fb55e8ff84cbc86ca3af465caaea5990b0ad55bd35859a125d76aad6bf89300		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F71 5840 bytes
font_01_sfnt_off0000633d.bin
bd5865f774c0b7501a1c5bca931712ce96336169d7f1eb83ef72a6f1cd56a13a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x633D 10076 bytes

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