Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdced0fe2fbd8241…

MALICIOUS

PDF

53.1 KB Created: 2020-09-02 04:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2e46724585b877d03a3e3ac7e5bf3e7 SHA-1: 343baa2465dd7f8ad8c61560cea7a24f529d9362 SHA-256: bdced0fe2fbd824128ad447306d355ebc7a8ecf64fc72eda8d86bf355acd4e9c
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically 'https://ttraff.link/wix?keyword=endnote+word+add+in'. This indicates the document is designed to redirect users to malicious infrastructure. The presence of a large number of external PDF links, many hosted on cdn.shopify.com, suggests an SEO-based link farm tactic to obscure the malicious redirector. The ML classifier also strongly flagged this PDF as malicious.

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.link/wix?keyword=endnote+word+add+in
    • https://cdn.shopify.com/s/files/1/0435/8026/0511/files/78036104497.pdf
    • https://cdn.shopify.com/s/files/1/0440/5752/6437/files/74775488417.pdf
    • https://cdn.shopify.com/s/files/1/0431/3242/0250/files/god_of_war_baldur_fight_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/1444/6489/files/48928951639.pdf
    • https://cdn.shopify.com/s/files/1/0428/6044/5855/files/manualidades_con_carton_reciclaje.pdf
    • https://cdn.shopify.com/s/files/1/0431/8383/3249/files/12631155102.pdf
    • https://cdn.shopify.com/s/files/1/0438/3975/0294/files/18241665012.pdf
    • https://cdn.shopify.com/s/files/1/0445/7195/1268/files/20700162701.pdf
    • https://cdn.shopify.com/s/files/1/0437/6592/3992/files/82871509712.pdf
    • https://cdn.shopify.com/s/files/1/0430/7379/8306/files/rodexokobada.pdf
    • https://cdn.shopify.com/s/files/1/0435/4605/0728/files/65162476413.pdf
    • https://static.usrfiles.com/ugd/ba3095_8738f5756f08450cb7e7e073f220b8e0.pdf
    • https://static.usrfiles.com/ugd/b8c837_8657dfc8d9494d70855fa76bb9c1a0e7.pdf
    • https://static.usrfiles.com/ugd/0b46e6_177505ad60414a6e9a159cf8c5abbdce.pdf
    • https://static.usrfiles.com/ugd/b8c837_ea6993ee717a4ae3825905e4c241461b.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_off00005b33.bin
b6b0e74ba58c3032da3f05629fa2be5a04a59f8ccef0923979800caf8db3cd20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B33 14528 bytes
font_01_sfnt_off00008a0c.bin
65586d09cb5de1e92e7a20671dd4fa9c21fb2fcd4fe77487b2c6232750a02789		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A0C 4660 bytes
font_02_sfnt_off00009a02.bin
c90c9c4616a9a8f303a66c96e16c4e0c8f1506d4216f37c80eb7730b56184349		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A02 14676 bytes

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