Malicious PDF — malware analysis report

Static analysis result for SHA-256 1389bb8109fc13b4…

MALICIOUS

PDF

118.2 KB Created: 2020-08-05 09:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: befba4ad6c7fe54f232e3d2a1cfb737e SHA-1: 1f31fa1351236f4f7ef324ef96bee65b25771fcd SHA-256: 1389bb8109fc13b4c3dc0e01cfb66d9bb20bb6b219402bb31aa65bd7a5b1d65b
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=alter+ego+plus+a2+corriges+pdf'. Additionally, it features a large number of external PDF links, suggesting a link farm or SEO abuse tactic. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the embedded URL and link farm indicate an attempt to lure users to malicious infrastructure.

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=alter+ego+plus+a2+corriges+pdf
    • http://files.morganmrich.com/uploads/1/3/2/7/132740723/6954852.pdf
    • http://files.motivationalshityall.com/uploads/1/3/0/8/130813757/6360893.pdf
    • http://files.gwrraohioc3.org/uploads/1/3/2/7/132712315/3224990.pdf
    • http://files.basslessons.tv/uploads/1/3/1/4/131437307/08055.pdf
    • http://files.manchestertrees.com/uploads/1/3/2/6/132695780/3346818.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/3764/6245/files/doziximariluxerokuvinesa.pdf
    • https://cdn.shopify.com/s/files/1/0428/7945/1289/files/acoso_escolar_peru.pdf
    • https://cdn.shopify.com/s/files/1/0436/0205/1235/files/4546827350.pdf
    • https://cdn.shopify.com/s/files/1/0430/9676/8673/files/binezokanubizawizij.pdf
    • https://cdn.shopify.com/s/files/1/0429/7926/2615/files/death_note_episodes_3.pdf
    • https://cdn.shopify.com/s/files/1/0437/6186/0757/files/excursions_in_modern_mathematics_8th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0432/3049/4878/files/53514727925.pdf
    • https://cdn.shopify.com/s/files/1/0433/0238/7867/files/34199706405.pdf
    • https://cdn.shopify.com/s/files/1/0430/8366/1461/files/zukimebuwiratujuruva.pdf
    • https://cdn.shopify.com/s/files/1/0431/7963/8942/files/91766227896.pdf
    • https://cdn.shopify.com/s/files/1/0438/9853/6091/files/kefoxikuzivoze.pdf
    • https://cdn.shopify.com/s/files/1/0437/7070/8129/files/canterville_ghost_summary.pdf
    • https://cdn.shopify.com/s/files/1/0432/2213/9041/files/56150881616.pdf
    • https://cdn.shopify.com/s/files/1/0429/3053/6614/files/49025188897.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017e3e.bin
7d31fb64a08fcbb916d232c851f22bf1be38fc99b0ff2698777edae9a51bba35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17E3E 5444 bytes
font_01_sfnt_off000190d8.bin
067118c7267a21126fd47d353b88298fe6f2345710a85729f08ef3a4d7ca4887		 pdf-font-stream PDF embedded font (sfnt) at offset 0x190D8 10700 bytes
font_02_sfnt_off0001b56e.bin
cbdbfe760b4a5610a5c6cdae2de6bcd38aba6314ce4962aa9665e81d84448a33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B56E 16220 bytes

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