Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cbff68bf38fb1da…

MALICIOUS

PDF

41.7 KB Created: 2020-08-09 20:38:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4c309d004e841a1b5c66b6489ce8553 SHA-1: 3f8c6fdcb27ce2b91219817274481e2c1072e63f SHA-256: 2cbff68bf38fb1dae798c4ce4c4e4d2717682c6c77cdf1dc128e453dac1cc068
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, including a known malicious redirector at ttraff.ru. The document body, though partially obfuscated, suggests a lure related to a 'senior account manager job description'. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous links indicates a potential attempt to drive traffic to malicious sites or distribute further payloads.

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=senior+account+manager+job+description+pdf
    • http://files.sapaintinghome.com/uploads/1/3/2/6/132683080/meralerovo.pdf
    • http://files.ku-iraqueer.org/uploads/1/3/1/4/131437056/vaderirixum_pixigozulinu_sekivujeb_tedevaxovilat.pdf
    • http://files.westminsterprez.com/uploads/1/3/0/8/130813448/vimosanul-pibitenowep-vovedib.pdf
    • https://cdn.shopify.com/s/files/1/0446/0537/4628/files/1645450375.pdf
    • https://cdn.shopify.com/s/files/1/0431/6004/3682/files/3431422264.pdf
    • https://cdn.shopify.com/s/files/1/0437/9872/4769/files/ridopawagikuxev.pdf
    • https://cdn.shopify.com/s/files/1/0429/9119/0167/files/badakusurexikavu.pdf
    • https://cdn.shopify.com/s/files/1/0430/0845/8905/files/jubaxinisizumosus.pdf
    • https://cdn.shopify.com/s/files/1/0429/7588/7523/files/14549093791.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wefudebavisizaku.pdf
    • https://cdn.shopify.com/s/files/1/0436/8482/3205/files/62374246945.pdf
    • https://cdn.shopify.com/s/files/1/0433/7418/2563/files/john_deere_l120_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0441/2270/1976/files/vugixemimopiteluga.pdf
    • https://cdn.shopify.com/s/files/1/0428/5261/4311/files/nizerododinifav.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_off00006495.bin
68af504c44a4824516a0768e080658cd2f5fa9024b75f1ab014a61257a89e295
pdf-font-stream PDF embedded font (sfnt) at offset 0x6495 5760 bytes
font_01_sfnt_off0000781c.bin
3d22a23e38dc68a202405b150516a5cea979a5488453647620270d1b655a20d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x781C 9872 bytes