Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b63f2c6cc18ca1e…

MALICIOUS

PDF

48.8 KB Created: 2020-08-06 23:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fdad271d355ea04ab3e879b8af9495b4 SHA-1: 694b2fc02af99b8b859de7dc3faecf0d535b2664 SHA-256: 9b63f2c6cc18ca1e76360971845c38ec24b941e8f77f9364c13bcbc6a9428443
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised as "Maersk aptitude test questions and answers pdf". This indicates a phishing or social engineering lure. The document also hosts a large number of other PDF files on Shopify domains, suggesting a link farm for SEO poisoning or to obscure the malicious redirector. The ML classifier strongly supports the malicious verdict.

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=maersk+aptitude+test+questions+and+answers+pdf
    • http://files.alcazarandalusians.com/uploads/1/3/2/6/132683264/xixawexelat.pdf
    • http://fowabif.elliskerleyfoundation.org/uploads/1/3/0/7/130738720/9966564.pdf
    • http://files.beautyandbreakdowns.com/uploads/1/3/1/6/131637014/sagexajazoni-dapabitofiwozuf-jusixuduwogu.pdf
    • http://files.burghyart.com/uploads/1/3/1/8/131871772/vevelu.pdf
    • https://cdn.shopify.com/s/files/1/0432/0703/2990/files/lasazetarikov.pdf
    • https://cdn.shopify.com/s/files/1/0430/3287/1074/files/sepajutazasiromesu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0957/1990/files/xuzudebevegosoriz.pdf
    • https://cdn.shopify.com/s/files/1/0430/4669/9165/files/24774731636.pdf
    • https://cdn.shopify.com/s/files/1/0428/0595/2671/files/1236824933.pdf
    • https://cdn.shopify.com/s/files/1/0429/1565/9942/files/nfl_week_3.pdf
    • https://cdn.shopify.com/s/files/1/0432/3636/0351/files/80516595577.pdf
    • https://cdn.shopify.com/s/files/1/0431/2127/9138/files/bazowuwoxetava.pdf
    • https://cdn.shopify.com/s/files/1/0438/1330/6530/files/58456836311.pdf
    • https://cdn.shopify.com/s/files/1/0433/9659/5861/files/dawagemaxo.pdf
    • https://cdn.shopify.com/s/files/1/0429/0940/1254/files/pefimegipasigek.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007267.bin
4bd64a2f8685c28398aace82ef305b2c309ff5382ed73b7744205b18b555e05c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7267 5172 bytes
font_01_sfnt_off0000841f.bin
7700614dc103bc8807bc058d307ffe72c1663ac25cdfa68c29fa488d8b1b0e11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x841F 10952 bytes
font_02_sfnt_off0000a7fc.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7FC 4324 bytes

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