Malicious PDF — malware analysis report

Static analysis result for SHA-256 456f27ab35f2a0f1…

MALICIOUS

PDF

40.5 KB Created: 2020-08-10 08:44:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b350d1da30253622052b6775d5a976a SHA-1: 439370569337b85892902f01a2a1bedcc9e0b739 SHA-256: 456f27ab35f2a0f1bec180d2771f886c38f4fbe01be1c265e09ed6c7f292e2dc
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning model and contains numerous embedded links. A critical heuristic identified a PDF redirector link pointing to 'ttraff.cc', which is known malicious infrastructure. Another critical heuristic indicates a PDF link farm hosted on Shopify, with many links pointing to PDFs. The document body, though heavily obfuscated, contains the same malicious URL and several Shopify URLs, suggesting a coordinated effort to distribute content or redirect users. No scripts were extracted from this sample.

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/pify?keyword=list+of+simple+adjectives+pdf
    • http://files.letsbthechange.com/uploads/1/3/1/4/131438195/9b4f358.pdf
    • http://files.groombridgewi.com/uploads/1/3/0/8/130874254/115b049279f37.pdf
    • http://files.newwavegymnastics.com/uploads/1/3/1/6/131636712/9667781.pdf
    • https://cdn.shopify.com/s/files/1/0430/7678/0192/files/vefogugokuxujuju.pdf
    • https://cdn.shopify.com/s/files/1/0433/3027/3448/files/23830931514.pdf
    • https://cdn.shopify.com/s/files/1/0433/2371/9845/files/danusowavabigiladurikidis.pdf
    • https://cdn.shopify.com/s/files/1/0428/7250/4483/files/68714562821.pdf
    • https://cdn.shopify.com/s/files/1/0438/4836/8288/files/34058951796.pdf
    • https://cdn.shopify.com/s/files/1/0427/6623/7852/files/66234185546.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/96617946950.pdf
    • https://cdn.shopify.com/s/files/1/0428/1267/0111/files/que_es_el_riesgo_laboral.pdf
    • https://cdn.shopify.com/s/files/1/0433/2408/0282/files/88114367371.pdf
    • https://cdn.shopify.com/s/files/1/0429/1903/5033/files/luzadizixo.pdf
    • https://cdn.shopify.com/s/files/1/0430/3169/1421/files/36643907840.pdf
    • https://cdn.shopify.com/s/files/1/0431/6980/8535/files/tegasozuzoguvemonasesopu.pdf
    • https://cdn.shopify.com/s/files/1/0448/2121/7442/files/cube_and_cuboid_formula.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_off000060d8.bin
432c43ed6a8b327f72df019876dc875f343d14bac18f57912941200edef033dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60D8 5284 bytes
font_01_sfnt_off000072d0.bin
fac0d023d177c547bf3b92003a5c252528653838777a5972f81f56d9de712ac9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72D0 10028 bytes

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