Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf3d45ebde51a819…

MALICIOUS

PDF

42.5 KB Created: 2020-08-12 16:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: efe598f772c49c833f0d69a4e0092935 SHA-1: bec71b1e71e32db893b5c5dcf70d403ff07bbc99 SHA-256: cf3d45ebde51a8191b91315735b2c43e419d2b43697ff678528bbbc55b1c47ff
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to benign content, but one critical link directs to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the target URL, suggesting the PDF's primary purpose is to redirect users to malicious infrastructure.

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=distributive%20property%20worksheets%20grade%208
    • http://files.allanpierce.com/uploads/1/3/0/7/130776104/343cba3fc.pdf
    • http://files.mrober.com/uploads/1/3/0/7/130738554/3944755feaa.pdf
    • http://gazaratab.locogringosstreettacos.com/uploads/1/3/0/8/130814297/vugimuw.pdf
    • https://cdn.shopify.com/s/files/1/0431/7220/0608/files/wulurifesumetavisageleli.pdf
    • https://cdn.shopify.com/s/files/1/0429/2778/4095/files/ableton_live_9_suite_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/669297692.pdf
    • https://cdn.shopify.com/s/files/1/0432/2318/7616/files/35589275061.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/lipid_bilayer_structure.pdf
    • https://cdn.shopify.com/s/files/1/0430/0252/7895/files/definition_of_management_journal.pdf
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/66322933355.pdf
    • https://cdn.shopify.com/s/files/1/0430/5541/5445/files/2502154359.pdf
    • https://cdn.shopify.com/s/files/1/0433/0756/5209/files/98524089349.pdf
    • https://cdn.shopify.com/s/files/1/0431/7036/5589/files/demakaf.pdf
    • https://cdn.shopify.com/s/files/1/0437/6847/9898/files/trastorno_esquizofrenia_paranoide.pdf
    • https://cdn.shopify.com/s/files/1/0438/0937/4368/files/contemporary_behavior_therapy_6th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0432/9881/6150/files/righteous_mind.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_off00005901.bin
d2e496c7461a9f5cbdbf665e6dcd474321c9f3001fbd519144dca95048dc6f81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5901 5616 bytes
font_01_sfnt_off00006c43.bin
7b2dc11b45179131b07aaa267eb93337ab3876cffb8805f8c38e454c953ef2f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C43 10152 bytes
font_02_sfnt_off00008ef7.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EF7 4324 bytes

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