Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9a2b242ad83a77e…

MALICIOUS

PDF

52.4 KB Created: 2020-09-01 05:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c73653dbffc28ca8256b4779a4b4b6ed SHA-1: 5bf9a40ce6ebd9a190e3a976abc454ebdcfe7e5d SHA-256: a9a2b242ad83a77e8acfbe5f2a69b99ae7a43f0e2845e2b71b40c5650597d83d
152 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to external PDF files. The primary malicious URL identified is https://ttraff.com/wix?keyword=anandi+gopal+all+songs+free. The document body contains garbled text and metadata, suggesting it is not intended for human consumption but rather as a vehicle for link distribution.

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=anandi+gopal+all+songs+free
    • https://static.usrfiles.com/ugd/b8c837_24eca2a73b324c8b913d0c713845b476.pdf
    • https://static.usrfiles.com/ugd/ad2ade_b1f51597f1d04a11abaced5ac74061d8.pdf
    • https://static.usrfiles.com/ugd/b8c837_b7381071972346f296888b70f5ad0415.pdf
    • https://static.usrfiles.com/ugd/4c76bf_37a7737955e34567aef1a6c56f3f9875.pdf
    • https://cdn.shopify.com/s/files/1/0439/1079/1323/files/lesekurimadir.pdf
    • https://cdn.shopify.com/s/files/1/0431/0119/2352/files/xalapasemabiferisovo.pdf
    • https://cdn.shopify.com/s/files/1/0431/1767/4656/files/island_royale_hacks.pdf
    • https://static.usrfiles.com/ugd/ea9bdf_3fe0349fda5646788794412c0442c221.pdf
    • https://static.usrfiles.com/ugd/f1780b_502f2d82fe1b4c16a31438935f47c2cd.pdf
    • https://static.usrfiles.com/ugd/b8c837_bf40f4c26e664fb09c7741a6be1858b6.pdf
    • https://static.usrfiles.com/ugd/739437_c136a134a1a54b388dc4c325784bc430.pdf
    • https://static.usrfiles.com/ugd/7c30af_95a5bf492372492c8b93ed68cb0fe16f.pdf
    • https://static.usrfiles.com/ugd/b8c837_570843dfa00848aa8f001642ff081495.pdf
    • https://static.usrfiles.com/ugd/409ca8_a6c43f9649f94ece8590e177fd5bcba1.pdf
    • https://static.usrfiles.com/ugd/270e53_07f11d871c9a4fdfa46d4ff5e863c89e.pdf
    • https://static.usrfiles.com/ugd/e2b09b_054c17daed19491f90c662d25ccb4879.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_off000086dc.bin
e845e74ffd7c7d1e20412e9166b9f3a6ce217c5a8ce4ab2f073f19c420115792		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86DC 5200 bytes
font_01_sfnt_off0000989f.bin
5fd1f75b72c8cfb46502908037ab8d0fbcd8ed0d5f4418105778c99600e18b31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x989F 14136 bytes

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