Malicious PDF — malware analysis report

Static analysis result for SHA-256 18cb2cc4f9a807cb…

MALICIOUS

PDF

54.4 KB Created: 2020-08-19 16:05:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c29214a28020bb8328ac6a98e0f3a70 SHA-1: e35946d0ed8a01c170e503fda591245a7c1def0f SHA-256: 18cb2cc4f9a807cb1014d87029f3ee9275c9e121a059e1fecc463c4d978149e0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is likely the primary malicious objective. The ML classifier also strongly indicated maliciousness.

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=matsumura+commutative+algebra
    • http://files.jgirello.com/uploads/1/3/1/4/131438069/942421ab5.pdf
    • http://files.ekcellrepair.com/uploads/1/3/0/7/130775126/5517154.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/3486/8897/files/ajax_call_content_type.pdf
    • https://cdn.shopify.com/s/files/1/0429/9459/8047/files/jekokimuweburidiba.pdf
    • https://cdn.shopify.com/s/files/1/0435/9749/6477/files/wanizirabadotemewuxa.pdf
    • https://cdn.shopify.com/s/files/1/0432/2947/9076/files/hypertension_guidelines_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/5136/8104/files/phaseone_capture_one_pro_11_free.pdf
    • https://cdn.shopify.com/s/files/1/0447/8894/0961/files/89232489033.pdf
    • https://cdn.shopify.com/s/files/1/0430/4578/1665/files/saturn_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0440/5755/9190/files/86223624389.pdf
    • https://cdn.shopify.com/s/files/1/0435/5905/9605/files/16378738148.pdf
    • https://cdn.shopify.com/s/files/1/0430/7258/5881/files/84764602131.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sovonuvebapade.pdf
    • https://cdn.shopify.com/s/files/1/0440/6634/1029/files/pojux.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_off00007f60.bin
746e6cb8a2da907625b4b6ab587722a32744c8d59ab5d53fd374f367b5bf66a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F60 5324 bytes
font_01_sfnt_off0000916c.bin
dad1789e342b4bf7c69064c43a6317dc4d7a18d9a09aa75ad872cc3327b13fcf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x916C 10508 bytes
font_02_sfnt_off0000b573.bin
096a93e25c7d594c795d32c1684208af0c357e190ad0c7a7901c74e877f03456		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB573 16616 bytes

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