Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3f14a86d37d0c24…

MALICIOUS

PDF

45.1 KB Created: 2020-09-01 18:11:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 313e74935754a0f79f69095739adce55 SHA-1: 9f4bf927d2f682a1639cae2beaf72ff45174edaa SHA-256: b3f14a86d37d0c24edd7ebe9d6cc4f8f4b786c1d3323211b1068df21d6667c56
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 'https://ttraff.cc/wix?keyword=waterfall+quest+osrs+low+level+guide'. This URL is likely used to direct users to a malicious site. The document also exhibits characteristics of a PDF link farm, with numerous embedded URLs, many pointing to Shopify domains, suggesting an attempt to obscure the malicious destination or engage in SEO manipulation for malicious purposes. The ML classifier also 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/wix?keyword=waterfall+quest+osrs+low+level+guide
    • https://static.usrfiles.com/ugd/8cbfce_cef3222712b64b66b1e0767eac640014.pdf
    • https://static.usrfiles.com/ugd/8ab72e_9ac8c04618dc481882b7914be8e93077.pdf
    • https://static.usrfiles.com/ugd/b8c837_c4a474de23234ad19ff6efe174bdf19a.pdf
    • https://static.usrfiles.com/ugd/6260fe_5c79f622e4334e66a231f98b80302cc3.pdf
    • https://static.usrfiles.com/ugd/760101_8bb3655c49d5432d9cd7c0826ec5fab9.pdf
    • https://cdn.shopify.com/s/files/1/0433/9492/4700/files/athlean_x_inferno_max_size.pdf
    • https://cdn.shopify.com/s/files/1/0435/0607/3759/files/dinosaur_4d_cards_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/5530/0249/files/85967606486.pdf
    • https://cdn.shopify.com/s/files/1/0431/7036/5602/files/classroom_management_for_young_learners.pdf
    • https://cdn.shopify.com/s/files/1/0435/1908/2655/files/52239543025.pdf
    • https://cdn.shopify.com/s/files/1/0432/7378/1408/files/general_aptitude_questions_free.pdf
    • https://cdn.shopify.com/s/files/1/0438/3283/6256/files/types_of_autoimmunity.pdf
    • https://cdn.shopify.com/s/files/1/0430/1740/4573/files/babugoxepoxafusonabifunup.pdf
    • https://cdn.shopify.com/s/files/1/0434/2172/8933/files/zolimovabiviliretowuked.pdf
    • https://cdn.shopify.com/s/files/1/0434/3663/8369/files/tekurumage.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_off000072c6.bin
f6fbb1a879e58f5df51bc2ecc50d561324afa86fed2ff8f322d0089bb8fc2bc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72C6 5368 bytes
font_01_sfnt_off0000852b.bin
f7f966b5e54c7607b810a3256387399934f78a73a4a7cb9ec2e6ae8b0874dd8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x852B 10096 bytes

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