Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6f8ba31252c167e…

MALICIOUS

PDF

45.7 KB Created: 2020-08-29 18:52:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0aaa99aed9d81ab58754ea3a981cb52 SHA-1: 1c866269d0696c356488ac696e2ac0584e00c872 SHA-256: f6f8ba31252c167ecc4ddd039a705c669c5809c47d98ed9408ee7a1f4136373b
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL https://ttraff.cc/wix?keyword=adjectives+english+french+pdf, which is likely intended to lead the user to a malicious site. The presence of numerous links suggests a link farm or redirection tactic to obscure the final malicious destination.

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/wix?keyword=adjectives+english+french+pdf
    • https://static.usrfiles.com/ugd/b8c837_48f1ac0621084e2fa3e0a556ab16f75d.pdf
    • https://static.usrfiles.com/ugd/97634b_84e63a3159914878a384b2f034b0495d.pdf
    • https://static.usrfiles.com/ugd/b8c837_46e32b1fb73c492895d5922b5a1a21b5.pdf
    • https://static.usrfiles.com/ugd/b8c837_7c00e3fd763d49aeb52b56d4275fa331.pdf
    • https://static.usrfiles.com/ugd/b8c837_a77fcee47bbc407a82ad57eb7e063926.pdf
    • https://cdn.shopify.com/s/files/1/0435/8491/3565/files/microstrip_patch_antenna.pdf
    • https://cdn.shopify.com/s/files/1/0435/7285/4939/files/wuvaripogemanax.pdf
    • https://cdn.shopify.com/s/files/1/0437/3187/8049/files/black_mambazo_homeless_free.pdf
    • https://cdn.shopify.com/s/files/1/0462/4741/1866/files/21121423520.pdf
    • https://cdn.shopify.com/s/files/1/0438/0635/9713/files/michigan_abortion_consent_form.pdf
    • https://cdn.shopify.com/s/files/1/0434/3506/5510/files/61617480288.pdf
    • https://cdn.shopify.com/s/files/1/0431/8180/1629/files/98052910167.pdf
    • https://cdn.shopify.com/s/files/1/0428/6310/0070/files/nabudibisowexixo.pdf
    • https://cdn.shopify.com/s/files/1/0431/3936/7061/files/47989293421.pdf
    • https://static.usrfiles.com/ugd/b8c837_79d62f8333df476db4b78d181843641c.pdf
    • https://static.usrfiles.com/ugd/b8c837_d5fc71bab1c54a5db60c1976060763a3.pdf
    • https://static.usrfiles.com/ugd/b8c837_2f4c05d4cd9f4809ad1a8fb468ce694b.pdf
    • https://static.usrfiles.com/ugd/b8c837_c61a0aee4fac4d42a7e57be25f962646.pdf
    • https://static.usrfiles.com/ugd/b8c837_a8fea8c739cd446ab0264cd15882f0bb.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_off000074cc.bin
0c638af9c0267b007c357a90d000129b317f61a2b714cf80a99d3b5d27ff51ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74CC 5332 bytes
font_01_sfnt_off000086fa.bin
7bc5c2301fdf80498e92d6ce1d8ae27e4a14ced444ec7820924a9c292a3f2918		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86FA 10088 bytes

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