Malicious PDF — malware analysis report

Static analysis result for SHA-256 8579f0f89c78dd2e…

MALICIOUS

PDF

45.2 KB Created: 2020-08-15 09:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09e7bb68ce388ce2e6f33a390974420a SHA-1: 2f62abbee83d3fc3264d5ca4554001dea7d45a62 SHA-256: 8579f0f89c78dd2ea198fb695773b8a57464a36f77fd6b79fa0c06f37aa42c5f
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a link to a known malicious redirector (ttraff.com). Additionally, a critical heuristic identified a PDF link farm hosted on Shopify, suggesting a tactic to manipulate search engine results or distribute further malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the link farm and redirector point to a distribution or SEO manipulation attack pattern.

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.com/wb?keyword=upsssc%20calendar%202019-20%20pdf%20download
    • http://files.marlrod.com/uploads/1/3/2/3/132302710/9657302.pdf
    • http://files.sthilaryhouse.co.uk/uploads/1/3/1/0/131070212/2669900.pdf
    • https://cdn.shopify.com/s/files/1/0432/1342/2753/files/zifemiburomawurelufa.pdf
    • https://cdn.shopify.com/s/files/1/0429/0406/0071/files/to_char_array_java.pdf
    • https://cdn.shopify.com/s/files/1/0435/7062/6723/files/english_encyclopedia_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0434/1442/1653/files/change_to_word_doc.pdf
    • https://cdn.shopify.com/s/files/1/0433/7578/8184/files/16269452040.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/89647405972.pdf
    • https://cdn.shopify.com/s/files/1/0429/0897/5263/files/83945105284.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/ielts_speaking_tips_and_samples_ielts_simon.pdf
    • https://cdn.shopify.com/s/files/1/0436/9701/2890/files/71879140026.pdf
    • https://cdn.shopify.com/s/files/1/0428/7240/6179/files/worafuwiwokazililisetin.pdf
    • https://cdn.shopify.com/s/files/1/0430/8795/4073/files/53543227876.pdf
    • https://cdn.shopify.com/s/files/1/0436/9340/8409/files/breitling_aerospace_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/6470/4662/files/bapakukefudukumorel.pdf
    • https://cdn.shopify.com/s/files/1/0432/3108/4708/files/83215550336.pdf
    • https://cdn.shopify.com/s/files/1/0434/2572/6625/files/notatitimaluzibamak.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_off00006013.bin
64af2f0e811f4b3f1cf6e2bad964e8aa53febcc657afba383258b1f3cb908fbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6013 5748 bytes
font_01_sfnt_off000073c6.bin
ff8f651c962b5bef11c59d74b22c915b4b3120f497db0c98823370eff739295a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73C6 10736 bytes
font_02_sfnt_off000098a7.bin
3a5c38ccbcfa13ea3cad4829b5b068cf860279d663dce4a9b3028d3508d4ada6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98A7 3936 bytes

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