Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bde3d41d72628a5…

MALICIOUS

PDF

33.7 KB Created: 2020-08-06 06:57:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c65848a83754dbee2e3d591458f10904 SHA-1: 6ba08d86e228b8d2ea9b4e134ca80771e8ea0124 SHA-256: 3bde3d41d72628a54448089c2bda4d2708dafcb96aec0b71e003d78667994ee8
152 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by a machine learning classifier and contains a large number of embedded links. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'ttraff.cc'. Another critical heuristic detected a PDF link farm with 30 external PDF links, many hosted on 'cdn.shopify.com'. The document body contains text related to 'Breitling transocean chronograph manual' and 'wkhtmltopdf', suggesting a lure for users interested in luxury watches or software documentation, which is then used to host a large number of SEO-optimized PDF links.

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=breitling%20transocean%20chronograph%20manual
    • http://files.rmwcaf.org/uploads/1/3/1/4/131406518/puxekavupupadi.pdf
    • http://files.brooksfrederickson.com/uploads/1/3/2/7/132710797/9331382.pdf
    • http://files.goldenreiki.co.nz/uploads/1/3/1/6/131636807/6776091.pdf
    • https://cdn.shopify.com/s/files/1/0432/1624/0807/files/fl_studio_12_producer_edition.pdf
    • https://cdn.shopify.com/s/files/1/0435/5453/7624/files/garawiwe.pdf
    • https://cdn.shopify.com/s/files/1/0434/4276/5976/files/ruxijezilusu.pdf
    • https://cdn.shopify.com/s/files/1/0435/4496/9367/files/synonym_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/2230/2888/files/34463298168.pdf
    • https://cdn.shopify.com/s/files/1/0431/0673/0144/files/42329725782.pdf
    • https://cdn.shopify.com/s/files/1/0431/4769/0145/files/rakur.pdf
    • https://cdn.shopify.com/s/files/1/0432/7673/0533/files/62300911076.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/87745409623.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zorugeligix.pdf
    • https://cdn.shopify.com/s/files/1/0431/8350/5570/files/7287311612.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bisadugizutojaririxenudep.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_off0000461e.bin
62277d879d5ac1a21227a68f50c866d9e68d1c4d07e073bad7bc6a735dfed6ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x461E 5396 bytes
font_01_sfnt_off0000584f.bin
74ffd51401ef02f603453c3da821a585e1c7e78b3e386f13b57ce0b29019cb4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x584F 9820 bytes

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