Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd9c46dd00936365…

MALICIOUS

PDF

57.4 KB Created: 2020-08-09 18:56:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24128d38731b718c5255535054612477 SHA-1: a223a51d916b2676bf2db4ed3cf7f545fe698271 SHA-256: fd9c46dd00936365613703bd5629ac177a84a1e98db75668e8722f3acd1fb2bd
154 Risk Score

Malware Insights

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

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. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm intended to manipulate search engine results or distribute further malicious 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.ru/pify?keyword=boogie+woogie+piano+styles+pdf
    • http://files.marbuildingsolutions.com/uploads/1/3/0/7/130776861/wegukale.pdf
    • http://files.church633.com/uploads/1/3/2/6/132682640/9e051c04df85a1c.pdf
    • http://files.2000enterprise.com/uploads/1/3/0/7/130739210/gavedador_xeteborojuj_zadoratajur_majuredabuli.pdf
    • http://fatot.massagetherapybynicolawright.com/uploads/1/3/0/8/130814017/1214641.pdf
    • https://cdn.shopify.com/s/files/1/0430/3772/0733/files/10427494195.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37872338034.pdf
    • https://cdn.shopify.com/s/files/1/0438/8470/7992/files/91866762937.pdf
    • https://cdn.shopify.com/s/files/1/0436/9799/5944/files/algebraic_expression_problems.pdf
    • https://cdn.shopify.com/s/files/1/0436/0221/5069/files/advanced_accounting_fischer_11th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0429/3407/5558/files/esercizi_sull_analisi_logica.pdf
    • https://cdn.shopify.com/s/files/1/0434/1566/6849/files/65394519022.pdf
    • https://cdn.shopify.com/s/files/1/0431/0440/3613/files/64096890523.pdf
    • https://cdn.shopify.com/s/files/1/0429/9508/9559/files/78129303556.pdf
    • https://cdn.shopify.com/s/files/1/0428/7404/4579/files/molejatuduvijazegapavibi.pdf
    • https://cdn.shopify.com/s/files/1/0434/1307/8168/files/area_and_perimeter_and_volume_formulas_for_all_shapes.pdf
    • https://cdn.shopify.com/s/files/1/0430/9296/7581/files/neither_nor_either_or.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_off0000a31c.bin
4c363d60cb7693822cea6dbe84b19d32e08b36a5812fa52302190b372ada3306		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA31C 5356 bytes
font_01_sfnt_off0000b58c.bin
8892d3eac4e818b7b3b30cf1dd18e6cbee89ddd0a9ed512ab8f6b1139dce63f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB58C 10192 bytes

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