Malicious PDF — malware analysis report

Static analysis result for SHA-256 5846231c2e1c8f71…

MALICIOUS

PDF

48.4 KB Created: 2020-08-12 07:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 324ed2a6bbf42ee5dd373a32c346ab6f SHA-1: 336eae12b5f38225a5c25e00fb2ec1d81e131bb9 SHA-256: 5846231c2e1c8f7133265001d2fd9818353a2bf3c042f6c9f5a330d66b318bb1
152 Risk Score

Malware Insights

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

The PDF was flagged by a critical heuristic for linking to known malicious redirector infrastructure and for containing a large link farm. The primary malicious URL is ttraff.ru, which is used to redirect to other sites. The document body contains garbled text but includes the malicious URL and references to 'wkhtmltopdf', suggesting it was generated programmatically. The presence of numerous Shopify links points to a strategy of using legitimate platforms to host or distribute malicious content, likely for SEO poisoning or to obscure the true origin of the attack.

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.ru/pify?keyword=baltimore+classification+of+virus+pdf
    • http://files.heritagepublishingus.com/uploads/1/3/0/9/130969718/kexofake_figefogo_nurevenuvabaj_wavemofib.pdf
    • http://files.robertsapolskyrocks.com/uploads/1/3/1/4/131437087/kawaluxu-zamopewebejuxo-kisig.pdf
    • http://files.thegaiancrystals.com/uploads/1/3/1/8/131871912/zokij.pdf
    • https://cdn.shopify.com/s/files/1/0436/9442/4232/files/78033781547.pdf
    • https://cdn.shopify.com/s/files/1/0429/7038/2490/files/19596884345.pdf
    • https://cdn.shopify.com/s/files/1/0434/0409/9735/files/82614122680.pdf
    • https://cdn.shopify.com/s/files/1/0440/5392/1957/files/23618275098.pdf
    • https://cdn.shopify.com/s/files/1/0433/4868/9050/files/98252517550.pdf
    • https://cdn.shopify.com/s/files/1/0446/1314/0643/files/gta_vice_city_cheats_pc_unlimited_money.pdf
    • https://cdn.shopify.com/s/files/1/0436/2944/5273/files/riesgo_cardiovascular_global.pdf
    • https://cdn.shopify.com/s/files/1/0437/6811/9458/files/zosupu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9073/9361/files/62128520296.pdf
    • https://cdn.shopify.com/s/files/1/0428/3888/4519/files/high_power_audio_amplifier_circuit.pdf
    • https://cdn.shopify.com/s/files/1/0432/7096/3350/files/zenanezikezi.pdf
    • https://cdn.shopify.com/s/files/1/0429/1470/9663/files/31956045750.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_off000071f8.bin
8ba8135eb548898472636ff62f82444b2fef9c2fd9266cac4c11435ae476d07c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71F8 5292 bytes
font_01_sfnt_off000083df.bin
441cc7789c8b824918e6cb7944789c138b6eebec0c0573fe260a10b14c72faaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83DF 10048 bytes
font_02_sfnt_off0000a630.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA630 4324 bytes

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