Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2399ec4ea9d0bc2…

MALICIOUS

PDF

48.9 KB Created: 2020-08-29 18:42:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2602d6b1d487a9015cafaee4c1b7aa4f SHA-1: 291d6122ef703330c312fb16289078b916da38c6 SHA-256: f2399ec4ea9d0bc2f08b78422fd46fc6ce3d07e7cf660e53019d31989112972c
154 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, a common tactic for distributing malicious content or conducting phishing attacks. One of these links, 'https://ttraff.com/wix?keyword=oyeronke+oyewumi+pdf', is identified as a known malicious redirector. The presence of a link farm and the ML classifier's high confidence score further support the malicious nature of this document. No scripts were extracted, but the link structure is indicative of a lure to a malicious site.

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.com/wix?keyword=oyeronke+oyewumi+pdf
    • https://cdn.shopify.com/s/files/1/0427/5588/3175/files/vanovume.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8861538602.pdf
    • https://cdn.shopify.com/s/files/1/0428/0814/8127/files/46743622893.pdf
    • https://cdn.shopify.com/s/files/1/0431/3019/2039/files/fefasudatuli.pdf
    • https://static.usrfiles.com/ugd/b8c837_955a13aea1074fa1b367fd6c49cbe768.pdf
    • https://static.usrfiles.com/ugd/b8c837_77f517d36e6e4c139874a7054dd4a178.pdf
    • https://static.usrfiles.com/ugd/b8c837_72c5ec11d5c444f1aa132617d50e0fc7.pdf
    • https://static.usrfiles.com/ugd/b8c837_685c5de96c4c4fb7b9e312da8da0a627.pdf
    • https://cdn.shopify.com/s/files/1/0427/8432/5798/files/best_book_for_english_grammar.pdf
    • https://cdn.shopify.com/s/files/1/0434/1573/2376/files/nipasifotedubitapix.pdf
    • https://cdn.shopify.com/s/files/1/0430/4509/3533/files/66650081454.pdf
    • https://cdn.shopify.com/s/files/1/0430/2913/5521/files/900_english_business_sentences.pdf
    • https://cdn.shopify.com/s/files/1/0431/2858/6402/files/on_the_far_side_of_the_mountain_comprehension_questions.pdf
    • https://cdn.shopify.com/s/files/1/0432/6142/7876/files/luxonitezupisimef.pdf
    • https://cdn.shopify.com/s/files/1/0433/9197/5580/files/logical_reasoning_questions_and_answers_for_interview.pdf
    • https://cdn.shopify.com/s/files/1/0429/9423/7593/files/merapixet.pdf
    • https://cdn.shopify.com/s/files/1/0434/8418/4728/files/44842311444.pdf
    • https://cdn.shopify.com/s/files/1/0430/7252/0353/files/vagedugoxoma.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_off00008199.bin
cfb3b7c2d8170a93fb6d7e3ff2bd609ed0c08a66779decc590c4e3d09c6074be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8199 5052 bytes
font_01_sfnt_off000092cc.bin
b926983967ec6ec43bdb47b7ba2f6dcd4994d87174381ab5ff4ac0ad942b20fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92CC 10740 bytes

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