Malicious PDF — malware analysis report

Static analysis result for SHA-256 59197b4331a3994c…

MALICIOUS

PDF

45.0 KB Created: 2020-09-01 19:11:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d3c3c2318d612ea10fd4968b36a7404 SHA-1: e2f4edaef2f545d3fbacaf72cd734f43abb3a8e1 SHA-256: 59197b4331a3994c496b967512d340a9b3db87487e680006ea11b0ef27ed214c
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains numerous embedded links. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.club/wix?keyword=daily+routine+writing+worksheets'. Another critical heuristic indicates the PDF is part of a link farm, with many links pointing to other PDFs hosted on platforms like Shopify. The document body, though heavily obfuscated, also contains the malicious redirector URL and several benign-looking PDF links, suggesting a coordinated effort to manipulate search results or drive traffic through a chain of redirects.

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.club/wix?keyword=daily+routine+writing+worksheets
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/79380768977.pdf
    • https://cdn.shopify.com/s/files/1/0427/9504/0924/files/james_stewart_calculus_6th_edition_solutions_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/6455/6710/files/vugagajozodedijuvejegab.pdf
    • https://cdn.shopify.com/s/files/1/0462/2942/2229/files/convergence_training_fire_extinguisher_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/6576/1176/files/93772276018.pdf
    • https://static.usrfiles.com/ugd/32acb1_5e6e1639cfc0484ca116c2038fc5bd4f.pdf
    • https://static.usrfiles.com/ugd/b8c837_425f876c42304fc58deadb6123b02bf4.pdf
    • https://static.usrfiles.com/ugd/105a8c_1f6cfc9a9d2640ecb6fc05dd5e05e364.pdf
    • https://cdn.shopify.com/s/files/1/0455/4152/3621/files/gate_2020_syllabus_ece.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fixasitisajixumazurezeve.pdf
    • https://cdn.shopify.com/s/files/1/0432/8675/7536/files/arturia_keylab_88_manual.pdf
    • https://static.usrfiles.com/ugd/b8c837_ab7a096ce89f4b098577212538215d70.pdf
    • https://static.usrfiles.com/ugd/ca300b_d325dc803b634b1fbf1c473d3875b78a.pdf
    • https://static.usrfiles.com/ugd/90c678_176ad5fdea3a47d2a4b0aa1d1a48a122.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_off00007172.bin
1be390994f13cf6f568763b948023a705913eb5ec54dafe12661f33c82863e12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7172 5204 bytes
font_01_sfnt_off0000833f.bin
25c55a668b9546b62272b3d6f7a1d4167fe4097af02f96a91fe7c05faa8ea600		 pdf-font-stream PDF embedded font (sfnt) at offset 0x833F 10412 bytes

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