Malicious PDF — malware analysis report

Static analysis result for SHA-256 923a85ca3a25a5b2…

MALICIOUS

PDF

68.7 KB Created: 2020-08-11 04:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23f24f9722d45ca81f0b536c3dcdf8f7 SHA-1: 71a3c958f2e9abcde107c41e2f7734c03fc35d09 SHA-256: 923a85ca3a25a5b27232e5e2fb950cd4b2203df8393662f7d7d8d10c161af61b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains multiple embedded URLs, with a critical heuristic firing for a malicious redirector link to 'ttraff.cc'. The document body, though heavily obfuscated, contains text related to PDF downloads and SEO, suggesting a lure. The presence of numerous links to Shopify domains, some benign and some unknown, indicates a link farm strategy. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful content.

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/wb?keyword=gravity%20rm%20drake%20pdf%20download
    • http://vitufo.abbyflemmer.com/uploads/1/3/2/6/132695569/jidamadopexesiv-gizovila-kobukivox.pdf
    • http://files.suttonclassroom.com/uploads/1/3/2/6/132695388/lolakozopigujo.pdf
    • http://suwopotub.trinidadrifleassociation.org/uploads/1/3/1/1/131164250/gozume.pdf
    • http://files.soupsatthestation.com/uploads/1/3/1/6/131637291/zuxuvugonusipof.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8865/files/wild_life_ring_tones.pdf
    • https://cdn.shopify.com/s/files/1/0429/5383/4649/files/vezupomenofurekojelav.pdf
    • https://cdn.shopify.com/s/files/1/0432/3858/8573/files/asyndeton_literary_definition.pdf
    • https://cdn.shopify.com/s/files/1/0429/8955/1770/files/skrillexmy_name_is_skrillex.pdf
    • https://cdn.shopify.com/s/files/1/0435/9094/2888/files/dozowupimerepivet.pdf
    • https://cdn.shopify.com/s/files/1/0431/6289/4498/files/rosuronizavi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/paxotaxazojulilinitulo.pdf
    • https://cdn.shopify.com/s/files/1/0440/1476/4190/files/57394405003.pdf
    • https://cdn.shopify.com/s/files/1/0431/4310/2613/files/nigerupir.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8853/files/ingersoll_rand_air_compressors_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/7877/0076/files/76884772022.pdf
    • https://cdn.shopify.com/s/files/1/0439/1718/1083/files/mortal_kombat_x_android_cheats.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gejazopemovaro.pdf
    • https://cdn.shopify.com/s/files/1/0429/4865/7311/files/41491044487.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_off0000cb56.bin
2b22c68db51752704ff0b703ba0e1e035208123e2bfd1a5d5ae44c0f9020a7d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB56 5356 bytes
font_01_sfnt_off0000dda8.bin
7ed7a5dc0d70bded0387be6a219f225b8f6e16d56992ba3c9d77a393c0e1f4ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA8 11976 bytes

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