Malicious PDF — malware analysis report

Static analysis result for SHA-256 959b732b23d66ccd…

MALICIOUS

PDF

42.2 KB Created: 2020-09-01 03:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31a601c614a8730a46d83e97aa3c9862 SHA-1: 89b323d53287cfb77db95c36218a762adb0ff32d SHA-256: 959b732b23d66ccdbadbd9c6075cf77c474d40b30bb86ce0fd1be686ccf1d098
152 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and contains numerous embedded URLs. One critical heuristic firing indicates the PDF links to known malicious redirector infrastructure, specifically 'https://ttraff.cc/wix?keyword=math+problem+solving+worksheets+high+school'. Another critical heuristic identified a PDF link farm, with many links pointing to Shopify domains, suggesting an attempt to manipulate search engine results or distribute further malicious content. The document body, though heavily obfuscated, also contains the malicious redirector URL.

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=math+problem+solving+worksheets+high+school
    • https://cdn.shopify.com/s/files/1/0437/8719/0434/files/nukawexujewubi.pdf
    • https://cdn.shopify.com/s/files/1/0437/9715/1904/files/bilizebes.pdf
    • https://cdn.shopify.com/s/files/1/0433/1733/0075/files/blessed_be_your_name_g.pdf
    • https://cdn.shopify.com/s/files/1/0436/6221/3273/files/7299721948.pdf
    • https://cdn.shopify.com/s/files/1/0435/7400/1825/files/43964750725.pdf
    • https://static.usrfiles.com/ugd/0f1814_f98e732e5b6c461496b55d81381f1b24.pdf
    • https://static.usrfiles.com/ugd/b8c837_585e8478dc684b0b9b27ade8e9e7a858.pdf
    • https://static.usrfiles.com/ugd/b8c837_99fe961d527c40e48348b34a240f6a04.pdf
    • https://static.usrfiles.com/ugd/b8c837_a70e80a52f3a4c23bb7641c38ced28af.pdf
    • https://static.usrfiles.com/ugd/74c34a_754c1bcb01174676918026ba1426d24c.pdf
    • https://cdn.shopify.com/s/files/1/0427/9900/5863/files/begug.pdf
    • https://cdn.shopify.com/s/files/1/0428/8312/1319/files/kosiwozuduluko.pdf
    • https://cdn.shopify.com/s/files/1/0431/5542/3383/files/pozisudumutizenowomenura.pdf
    • https://cdn.shopify.com/s/files/1/0431/1459/4464/files/kibigujamog.pdf
    • https://cdn.shopify.com/s/files/1/0429/7487/1711/files/meiosis_review_worksheet_answers.pdf
    • https://static.usrfiles.com/ugd/1c90dc_77eb13bd8e174f249ad4e89c8b7c6cea.pdf
    • https://static.usrfiles.com/ugd/1cc7e8_3c1f44f45dd6475c94e8ffef1773734a.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_off000064c0.bin
fd5824e85d4f2b462389beec80730c7b83fc4112dec4090d36c2b9de582c2c16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64C0 5708 bytes
font_01_sfnt_off00007821.bin
56bff8f9df39e73d45da6fda5314e0e6a341fe17cd26ea5c4a0213dc58b570a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7821 10508 bytes

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