Malicious PDF — malware analysis report

Static analysis result for SHA-256 84b0cdecb1fa88b0…

MALICIOUS

PDF

42.0 KB Created: 2020-08-30 21:09:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb691d99fba313959f2f4dff7a67ddc3 SHA-1: 260d74b115edd8ff3799d6311a997b6a91fa3544 SHA-256: 84b0cdecb1fa88b0e3175b9fc939d7ced0255ffda98262b6941f16e4b5718870
152 Risk Score

Malware Insights

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

The PDF document was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The embedded URL points to a known malicious redirector, 'ttraff.ru', which is likely used to funnel victims to further malicious content. The document body, though heavily obfuscated, contains references to this URL and other PDF links, supporting the link farm detection.

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/wix?keyword=sniper+cosmetics+tf2
    • https://static.usrfiles.com/ugd/36f25b_605218d3aaf84b91ada237edcacd78a6.pdf
    • https://static.usrfiles.com/ugd/b8c837_172d42e92ff247ad86fd322153d4e154.pdf
    • https://static.usrfiles.com/ugd/ace02d_9a29a4b877f34f7091ba5d282b72f8e2.pdf
    • https://cdn.shopify.com/s/files/1/0440/8619/8424/files/pemipodaju.pdf
    • https://cdn.shopify.com/s/files/1/0433/8017/9109/files/basic_algebra_problems_and_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0432/2207/3506/files/42974096649.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/niborenegukudokeregus.pdf
    • https://cdn.shopify.com/s/files/1/0437/1572/3414/files/holy_books_of_hinduism.pdf
    • https://cdn.shopify.com/s/files/1/0431/3425/5258/files/larousse_english_french_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0432/5218/7298/files/activity_diagram_for_online_food_ordering_system.pdf
    • https://cdn.shopify.com/s/files/1/0428/7925/4694/files/mowarurenesumuwipojelufa.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_off00006702.bin
c086c12adc5d52db37f6d3739146f391d06865b883307af15151acd587c19d8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6702 5152 bytes
font_01_sfnt_off0000786d.bin
459d86088dd686cc511e42883d5165eca478b996ea57b1a8827899d895d8a57a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x786D 10428 bytes

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