Malicious PDF — malware analysis report

Static analysis result for SHA-256 eee2b8ee177ecd1f…

MALICIOUS

PDF

43.6 KB Created: 2020-08-03 18:43:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f91dc821648dd2ac0bdd39be253446cb SHA-1: de7a90b5584a5e1ee33bae47358561f43a5ef09f SHA-256: eee2b8ee177ecd1fce61b830d56b9b0828d339623b75bf1745cb40377a242dca
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links pointing to external PDF files, many hosted on Shopify. One of the primary links directs to a known malicious redirector. This suggests the document is part of a link farm or SEO manipulation scheme, potentially used to distribute malware or phish users. No scripts were extracted, and the document body is largely unreadable binary data, but the heuristic firings strongly indicate malicious intent through link redirection and mass linking.

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=acidosis+metabolica+refractaria+a+tratamiento+pdf
    • http://files.thebotanyscholar.com/uploads/1/3/0/7/130775471/3919608.pdf
    • http://files.southplainswoodturners.org/uploads/1/3/0/9/130969551/nunoxidu_vunurorubu_gunivarapututus.pdf
    • http://files.speenallotments.org/uploads/1/3/0/7/130739778/47e76.pdf
    • http://files.westernwilcodemsclub.com/uploads/1/3/1/8/131871980/9999623.pdf
    • http://files.mountaineerauctions.com/uploads/1/3/2/8/132814239/5ff98.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kixekitigatozodevejale.pdf
    • https://cdn.shopify.com/s/files/1/0432/7509/2132/files/gajuwolejozudunas.pdf
    • https://cdn.shopify.com/s/files/1/0437/1313/4757/files/whirlpool_serial_number_lookup.pdf
    • https://cdn.shopify.com/s/files/1/0432/5192/5155/files/doputebufopepifo.pdf
    • https://cdn.shopify.com/s/files/1/0438/3562/1526/files/35047623097.pdf
    • https://cdn.shopify.com/s/files/1/0434/9480/1568/files/63269329800.pdf
    • https://cdn.shopify.com/s/files/1/0440/6099/9830/files/15191573921.pdf
    • https://cdn.shopify.com/s/files/1/0431/3081/4626/files/ruwapezotopitokuze.pdf
    • https://cdn.shopify.com/s/files/1/0432/2597/2904/files/where_can_i_watch_smallville.pdf
    • https://cdn.shopify.com/s/files/1/0428/0942/6079/files/18694475463.pdf
    • https://cdn.shopify.com/s/files/1/0428/8770/8825/files/86915466927.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_off00006cff.bin
62b8047d380cb879fd94fbd3e0defc2b4f34268fba965c8e3298596cb942a1b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CFF 5432 bytes
font_01_sfnt_off00007f56.bin
aa95dee165335ca0df8c2d7618bab61a78c089b512fc2fd433ff399dd4d02720		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F56 9924 bytes

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