Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1291c75db08f184…

MALICIOUS

PDF

42.4 KB Created: 2020-09-02 08:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca7ab34b050d0962b7a40c3c4b480fb8 SHA-1: e01b321c2bdfad2c22d216106630e6bb8b7e34c7 SHA-256: d1291c75db08f184c10980e46cb945c00a910a349a9a24bf6a841547093a9ce2
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains multiple embedded links, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to a car manual, likely a lure to disguise the malicious intent. The presence of numerous links to external PDFs, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier 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.com/wix?keyword=manual+painel+citroen+c3+2006
    • https://cdn.shopify.com/s/files/1/0451/4299/9194/files/arduino_uno_schematic.pdf
    • https://cdn.shopify.com/s/files/1/0430/4257/0402/files/62252259795.pdf
    • https://cdn.shopify.com/s/files/1/0437/3151/7592/files/king_s_raid_clause_guide_2018.pdf
    • https://static.usrfiles.com/ugd/b8c837_0c95efc838ce4fc3a807e582ec3d5b63.pdf
    • https://cdn.shopify.com/s/files/1/0429/4157/9420/files/zerapekiduzex.pdf
    • https://cdn.shopify.com/s/files/1/0437/1054/6070/files/42225118260.pdf
    • https://cdn.shopify.com/s/files/1/0434/9257/3336/files/85582404896.pdf
    • https://cdn.shopify.com/s/files/1/0431/2855/3634/files/vunijinonajokebozabeg.pdf
    • https://cdn.shopify.com/s/files/1/0436/1460/1378/files/99558038737.pdf
    • https://static.usrfiles.com/ugd/f103bb_dfc7ca43a1e84310961c9de4e38e2abc.pdf
    • https://static.usrfiles.com/ugd/bf07b1_0a6888dc4f4d434db22eca5a045391ee.pdf
    • https://static.usrfiles.com/ugd/b8c837_4db56a3895fa4965a81bf66695c320eb.pdf
    • https://static.usrfiles.com/ugd/cafc24_1d9a9776b5454bed91b878719c14e44b.pdf
    • https://static.usrfiles.com/ugd/0d2908_cc474c5571d743659c995922ddeca0fc.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_off00005e56.bin
98ab0b0212ba585029558970167141c77599c1b21ab6d43572748e01c763a74c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E56 5344 bytes
font_01_sfnt_off0000709b.bin
1dc1a0ac71283548b180d499277f272b3fbb0e5f3860417c20ec858ca39aeca1
pdf-font-stream PDF embedded font (sfnt) at offset 0x709B 13588 bytes