Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd89c7640c92b632…

MALICIOUS

PDF

41.3 KB Created: 2020-08-07 05:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13980c064d053ebf7210a2bf186c3edc SHA-1: 2d6bdebe83fc7280b4719091e99c96b1e935b6b0 SHA-256: fd89c7640c92b63215c729838f13c6b267e899321e232bb6aa2b4e80fcf1c587
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a significant number of embedded links, with a critical heuristic firing indicating a malicious redirector. The primary URL, 'https://ttraff.cc/pify?keyword=oxford+discover+6+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and numerous other Shopify links, suggesting a link farm designed to lead users to malicious content. The ML classifier strongly flagged this PDF as malicious.

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=oxford+discover+6+pdf
    • http://files.beachcitywindows.com/uploads/1/3/0/7/130739684/1d88a89ba52d07.pdf
    • http://files.maplestconstruct.com/uploads/1/3/2/6/132682646/750898.pdf
    • http://files.greatpurpose.org/uploads/1/3/0/7/130739287/doxagigix.pdf
    • http://files.hawaiiwaterpolo.com/uploads/1/3/1/0/131070938/4467b.pdf
    • http://junak.byzantineegypt.org/uploads/1/3/1/4/131453060/9029204.pdf
    • https://cdn.shopify.com/s/files/1/0438/6743/9259/files/100_books_everyone_should_read_before_they_die.pdf
    • https://cdn.shopify.com/s/files/1/0437/6264/7189/files/bowifavanufevikavesi.pdf
    • https://cdn.shopify.com/s/files/1/0435/9772/5864/files/sabovuzavotulijumitawe.pdf
    • https://cdn.shopify.com/s/files/1/0440/6745/5128/files/gixeterulu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5993/6421/files/fevado.pdf
    • https://cdn.shopify.com/s/files/1/0434/3057/6278/files/22154229069.pdf
    • https://cdn.shopify.com/s/files/1/0431/8547/1656/files/141342013.pdf
    • https://cdn.shopify.com/s/files/1/0436/8711/6965/files/vocabulary_word_list.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7741/files/cvc_words_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/3867/1010/files/25115588407.pdf
    • https://cdn.shopify.com/s/files/1/0434/9899/5878/files/8159272564.pdf
    • https://cdn.shopify.com/s/files/1/0429/2729/2582/files/47369396045.pdf
    • https://cdn.shopify.com/s/files/1/0435/2868/3672/files/26523716859.pdf
    • https://cdn.shopify.com/s/files/1/0428/2135/3635/files/zusaronegufu.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_off00006404.bin
ddb1fc12bf86feb3053470030651502c2438b3cac5372f60770a4d2891befc3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6404 5216 bytes
font_01_sfnt_off000075e2.bin
8cdcdce31dd95125127a9f0ef3b644f7590a8baec749dbe3ca391f4bc26aa712		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75E2 10088 bytes

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