Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a0c0346e568615e…

MALICIOUS

PDF

42.3 KB Created: 2020-08-11 07:31:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d3a9031a8593115820c0ebda03892f0 SHA-1: e5bca617d22307c2bb3847ced1ec3dd6996eb377 SHA-256: 4a0c0346e568615e49a296bc5c42df957cc9190e5960f115211882394d39b59f
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to ttraff.cc. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify, likely for SEO poisoning. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring users to malicious sites through a deceptive link farm.

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=analyzing+financial+statements+8th+edition+pdf
    • http://zivep.boekinbinding.nl/uploads/1/3/1/6/131637881/xavibiwatimexuf.pdf
    • http://files.andreajane.ca/uploads/1/3/1/4/131437249/7839406.pdf
    • http://files.kapanshipman.com/uploads/1/3/0/7/130740258/ee7f97.pdf
    • http://files.annalisavivona.com/uploads/1/3/2/3/132302923/3e16c6c3.pdf
    • https://cdn.shopify.com/s/files/1/0431/7573/9553/files/budgeting_and_budgetary_control_in_manufacturing_companies.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38743570217.pdf
    • https://cdn.shopify.com/s/files/1/0430/0088/9507/files/1482342332.pdf
    • https://cdn.shopify.com/s/files/1/0431/6617/1296/files/60232289420.pdf
    • https://cdn.shopify.com/s/files/1/0435/8035/8815/files/polaris_snowmobile_service_manual_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/5448/7969/files/vagetilizabawizug.pdf
    • https://cdn.shopify.com/s/files/1/0438/1271/6701/files/gedotojaraxugom.pdf
    • https://cdn.shopify.com/s/files/1/0429/8457/1031/files/76642817097.pdf
    • https://cdn.shopify.com/s/files/1/0433/2866/7798/files/robinhood_automated_trading.pdf
    • https://cdn.shopify.com/s/files/1/0432/1103/0690/files/63665922564.pdf
    • https://cdn.shopify.com/s/files/1/0433/4800/0927/files/92844556106.pdf
    • https://cdn.shopify.com/s/files/1/0430/4994/3202/files/53560600128.pdf
    • https://cdn.shopify.com/s/files/1/0434/1458/5509/files/61644448132.pdf
    • https://cdn.shopify.com/s/files/1/0431/6315/6641/files/dafukofelesa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000057a9.bin
24fa4feb53765da7569db2497919afa62f356acb0cb0dd275cef8c1d2f882001		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57A9 5596 bytes
font_01_sfnt_off00006a94.bin
44bc917d3daffac9766ee1807af758170c51c15886ed069feefdce0b06d7963f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A94 10296 bytes
font_02_sfnt_off00008da8.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DA8 4324 bytes

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