Malicious PDF — malware analysis report

Static analysis result for SHA-256 798b7a9f4494975f…

MALICIOUS

PDF

77.8 KB Created: 2020-09-07 16:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32498135341e052fd04969935a64c56a SHA-1: ad80886731d39e67915aebc8086c2fbf4f4c6428 SHA-256: 798b7a9f4494975f1f4c54fd83ad2fa0ffce877847a67a9a9c25318e09d696a9
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.club/wix?keyword=kdka+reporters+2018'. Additionally, another critical heuristic indicates a PDF link farm, suggesting an attempt to generate traffic or distribute content through multiple linked PDFs. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URL and link farm heuristics are sufficient to determine the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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=kdka+reporters+2018
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lojuxefututa.pdf
    • https://cdn.shopify.com/s/files/1/0434/8451/2406/files/88030234838.pdf
    • https://cdn.shopify.com/s/files/1/0433/3040/4502/files/13524024285.pdf
    • https://cdn.shopify.com/s/files/1/0437/1588/7256/files/use_of_articles_in_english_grammar_examples.pdf
    • https://static.usrfiles.com/ugd/cc03df_3ce113395bb54e0caa08955fe278541a.pdf
    • https://static.usrfiles.com/ugd/140efa_7abc4944c94e435893c14467ef4be13b.pdf
    • https://static.usrfiles.com/ugd/cf14a4_dcc265f25d2742c1ad2b519a3f9ff9d2.pdf
    • https://static.usrfiles.com/ugd/3e5db3_145be5c44b364d6ea745c0cd18017c4a.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_off0000e387.bin
45389be93b9e084fc5060b7d78a3f2f292c5b8958e736c216aaa192d20fbd061		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE387 5476 bytes
font_01_sfnt_off0000f635.bin
665342c50a25160593e57e1dbc771c51064a44698a6b523db71167611f020174		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF635 16220 bytes

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