Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbf9b702cd09a4d0…

MALICIOUS

PDF

41.2 KB Created: 2020-08-07 03:27:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8e92f86539b687b9807b886026f0ba8 SHA-1: bf8c41cc010168e9abab428e9df012289fd625e0 SHA-256: dbf9b702cd09a4d06cb99212e0c00213df7b3d2906bf9c2ff8b375ffa3655350
152 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by an ML classifier and contains a significant number of embedded links. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=redact+pdf+text+free'. Another critical heuristic indicated a PDF link farm, with many links pointing to Shopify domains, likely as a method to obscure the true malicious intent. The document body itself contains garbled text but includes the malicious redirector URL and several Shopify URLs, reinforcing the link-based attack pattern.

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=redact+pdf+text+free
    • http://files.bajagreenbuilder.com/uploads/1/3/1/6/131607063/6501986.pdf
    • http://files.muddyriverartassociation.org/uploads/1/3/1/6/131637186/8fe45.pdf
    • http://files.sacredstonesministries.org/uploads/1/3/1/4/131453456/4837902.pdf
    • https://cdn.shopify.com/s/files/1/0435/7701/6483/files/18052588483.pdf
    • https://cdn.shopify.com/s/files/1/0435/5335/7985/files/51616456730.pdf
    • https://cdn.shopify.com/s/files/1/0437/7791/7085/files/2d6_vs_1d12.pdf
    • https://cdn.shopify.com/s/files/1/0429/6713/8460/files/losexizamotomujig.pdf
    • https://cdn.shopify.com/s/files/1/0430/0704/9877/files/86102319166.pdf
    • https://cdn.shopify.com/s/files/1/0433/3453/3275/files/download_new_school_physics_textbook_for_secondary_school.pdf
    • https://cdn.shopify.com/s/files/1/0431/4375/7992/files/continuous_probability_distribution_examples_and_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/82191842179.pdf
    • https://cdn.shopify.com/s/files/1/0434/7507/5225/files/31439524572.pdf
    • https://cdn.shopify.com/s/files/1/0430/5698/8311/files/6620687269.pdf
    • https://cdn.shopify.com/s/files/1/0429/9702/2879/files/questes_administrao_pblica_art_37_ao_41.pdf
    • https://cdn.shopify.com/s/files/1/0428/3708/2271/files/dukuzopakiwuroxixe.pdf
    • https://cdn.shopify.com/s/files/1/0431/2147/5738/files/27369292761.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_off0000636a.bin
b95a7b23955fd2e1237f2a7013f7dad37ffeb72452dc9b4b5d9ca937a7d5b949		 pdf-font-stream PDF embedded font (sfnt) at offset 0x636A 5012 bytes
font_01_sfnt_off00007498.bin
f8dc87d4a2607a83fe16f6affdefc60f03e9ea0d9450fd6a92325ee91d932af1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7498 10464 bytes

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