Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c64d30fcc121281…

MALICIOUS

PDF

52.5 KB Created: 2020-08-07 06:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e79dca825cba01c7b2dce0f2a5fb8866 SHA-1: c805a433aa237f394031c81e649d7eb5128d418c SHA-256: 9c64d30fcc1212811d8e9477e2f0250eed3579f6be8405d8c491307aefc751c8
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is likely used to obscure the final destination. The document body, though heavily obfuscated, contains the same malicious URL, suggesting the 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/pify?keyword=mariage+d+amour+partitura+piano+pdf+gratis
    • http://muvufi.maplebarnstudio.com/uploads/1/3/1/4/131438464/e0ebea4c3c8639d.pdf
    • http://files.kimsjoy.com/uploads/1/3/2/6/132695519/fenatedunijozeduwel.pdf
    • http://files.animalintuitivereading.com/uploads/1/3/0/7/130739789/ee40f545295c8d.pdf
    • http://files.pilatesante.com/uploads/1/3/1/6/131606405/peseba.pdf
    • https://cdn.shopify.com/s/files/1/0441/2011/3304/files/el_suicida_alfonso_reyes.pdf
    • https://cdn.shopify.com/s/files/1/0427/8861/8396/files/6614167855.pdf
    • https://cdn.shopify.com/s/files/1/0434/1779/6770/files/xedexojuja.pdf
    • https://cdn.shopify.com/s/files/1/0428/5012/3943/files/14138938258.pdf
    • https://cdn.shopify.com/s/files/1/0437/5920/6558/files/life_and_death_novel.pdf
    • https://cdn.shopify.com/s/files/1/0434/2520/2332/files/shin_chan_english_dubbed.pdf
    • https://cdn.shopify.com/s/files/1/0431/6577/8076/files/jefujodemifojoke.pdf
    • https://cdn.shopify.com/s/files/1/0429/1995/2540/files/nikon_coolpix_s7000_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/4445/4056/files/rofepipojapijetikub.pdf
    • https://cdn.shopify.com/s/files/1/0431/6535/2093/files/videga.pdf
    • https://cdn.shopify.com/s/files/1/0431/8471/7979/files/62529432420.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_off00008fda.bin
741fc8bffd916f27d9738bd7aa255802566deff2385117683766c5a6d6b6aa29
pdf-font-stream PDF embedded font (sfnt) at offset 0x8FDA 5336 bytes
font_01_sfnt_off0000a1f8.bin
810d26e310ffad7f2f32d33d7bc1d7d9449156900a6d5c145e2a13b14d0e0cea
pdf-font-stream PDF embedded font (sfnt) at offset 0xA1F8 10088 bytes