Malicious PDF — malware analysis report

Static analysis result for SHA-256 c87672c3715d97b7…

MALICIOUS

PDF

50.9 KB Created: 2020-08-12 23:42:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22897c9df94ebb0f4b9d411b03a6d6e9 SHA-1: e4b11cc510657fc3ad16ea7e06301c8dc675bc38 SHA-256: c87672c3715d97b7765ed629f908e5d8a2fdc3f8c8bd489f8619621df12a4210
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm for SEO poisoning. One critical heuristic indicates a direct link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=princeton+review+cracking+the+gmat+pdf'. The document body, though heavily obfuscated, contains this same URL, indicating the primary intent is to redirect users to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF.

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=princeton+review+cracking+the+gmat+pdf
    • http://files.caseycolwell.com/uploads/1/3/1/0/131070711/8423849.pdf
    • http://files.healthyhomespestcontrol.net/uploads/1/3/1/1/131163683/2816201.pdf
    • http://files.fastwayuniforms.com/uploads/1/3/2/7/132712225/b00cd1.pdf
    • http://dasugeri.purefreedomwellness.com/uploads/1/3/0/7/130740141/9157974.pdf
    • https://cdn.shopify.com/s/files/1/0427/8219/5879/files/goxemegiduguzivu.pdf
    • https://cdn.shopify.com/s/files/1/0437/7280/5277/files/wekitinovodimuleni.pdf
    • https://cdn.shopify.com/s/files/1/0434/6891/4838/files/questions_on_algebraic_expressions_for_class_8.pdf
    • https://cdn.shopify.com/s/files/1/0434/0105/2312/files/36125047895.pdf
    • https://cdn.shopify.com/s/files/1/0427/8062/3015/files/dijajaxapam.pdf
    • https://cdn.shopify.com/s/files/1/0429/7601/8585/files/introduction_to_combustion_turns_solution_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/2480/9116/files/lurumogevibutuji.pdf
    • https://cdn.shopify.com/s/files/1/0431/6938/2557/files/pajomakuroge.pdf
    • https://cdn.shopify.com/s/files/1/0430/5007/4269/files/lokevaduvomiv.pdf
    • https://cdn.shopify.com/s/files/1/0430/4555/2277/files/284216871.pdf
    • https://cdn.shopify.com/s/files/1/0435/2029/5064/files/medidas_dela_cancha_de_basquetbol.pdf
    • https://cdn.shopify.com/s/files/1/0432/3485/3021/files/47756241560.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_off0000745b.bin
f66c80f3359d878e990423ba1749150653459b653a95d27b6eacc174447d9ee0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x745B 5576 bytes
font_01_sfnt_off00008728.bin
ffdd590bfdbab459dc9dcc3458ef3842620453808534791927f07b47db88175c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8728 7148 bytes
font_02_sfnt_off00009a8b.bin
8a896f9725cec5b871db32643d9ad20d8bb368ee3fd1c27198537d7ca9548958		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A8B 10472 bytes

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