Malicious PDF — malware analysis report

Static analysis result for SHA-256 01ab05b3e664dc77…

MALICIOUS

PDF

47.0 KB Created: 2020-08-09 15:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9caa6015ee28721f8bc6818a2121a08 SHA-1: ffe6ac387b826fb725af8a7c10ba47e7f44c2a96 SHA-256: 01ab05b3e664dc77023a0259e46ba19d72b0bd2ea008992da412806308810f4b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious Link T1566.002 Phishing: Spearphishing Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=caballo+de+troya+6+pdf+download'. Additionally, it hosts a large number of external PDF links, suggesting a link farm strategy. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves redirecting users through a series of links, likely to distribute further malware or engage in SEO poisoning.

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/pify?keyword=caballo+de+troya+6+pdf+download
    • http://files.petportraitsbyjeni.com/uploads/1/3/0/8/130874257/27045.pdf
    • http://files.supervillesovak.com/uploads/1/3/2/6/132680796/aa2b1.pdf
    • http://files.vierajrotc.org/uploads/1/3/0/7/130740624/muzijos.pdf
    • http://files.sarahkarjian.com/uploads/1/3/2/7/132740805/b8a1c21956.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/2685/6610/files/lomerovaj.pdf
    • https://cdn.shopify.com/s/files/1/0436/5726/5305/files/33886912995.pdf
    • https://cdn.shopify.com/s/files/1/0431/4329/9232/files/dirak.pdf
    • https://cdn.shopify.com/s/files/1/0439/2851/8824/files/matchbox_twenty_3am.pdf
    • https://cdn.shopify.com/s/files/1/0432/0778/6654/files/rikagakunitozutelugewo.pdf
    • https://cdn.shopify.com/s/files/1/0437/8935/3118/files/tifaxifaliwemutin.pdf
    • https://cdn.shopify.com/s/files/1/0430/8339/9329/files/65877342336.pdf
    • https://cdn.shopify.com/s/files/1/0434/2143/4005/files/kifebovinobekasibijisep.pdf
    • https://cdn.shopify.com/s/files/1/0434/1104/6556/files/jijotusivejonegirid.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zawitowawipujeko.pdf
    • https://cdn.shopify.com/s/files/1/0430/4257/0401/files/the_blind_side_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/5026/1911/files/puzolediroz.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_off0000613f.bin
cf578c2dfc7b513e87777e69e3e3de3ca95d671a26dca92d72b78ba6d13c3086		 pdf-font-stream PDF embedded font (sfnt) at offset 0x613F 5248 bytes
font_01_sfnt_off00007337.bin
05e8f3b4732e883eef35e1cff8651332cc1f3c7858e397ce212acfb83c2dfc19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7337 11448 bytes
font_02_sfnt_off000098ac.bin
87e6228e3a298088c626b13d05ec6bdf5f78b8c0608f7930086b21be0118cf33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98AC 16084 bytes

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