Malicious PDF — malware analysis report

Static analysis result for SHA-256 9008b386a73ca435…

MALICIOUS

PDF

45.3 KB Created: 2020-08-05 09:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab23ae3a7797f18816d870b451802c64 SHA-1: 8103ca55d2d935b5cd4ba5602a406bad6a7f3863 SHA-256: 9008b386a73ca43502aa4705da7a3435a6f0b23a47d566b50f0daca31255b6d9
150 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains numerous embedded links. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=someone+anyone+worksheet+pdf'. Another critical heuristic noted a large number of external PDF links, suggesting a link farm or SEO poisoning tactic. The document body contains garbled text but includes the same malicious URL, reinforcing the redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.ru/pify?keyword=someone+anyone+worksheet+pdf
    • http://mulenef.rachelnamba.com/uploads/1/3/0/9/130969904/tavisabi-jirufa-kexug.pdf
    • http://files.tinmasoft.com/uploads/1/3/2/6/132681440/tojisifabudobev.pdf
    • http://files.marksullivan.ca/uploads/1/3/0/7/130775735/kurixunefusaxu.pdf
    • http://files.lembixlab.net/uploads/1/3/0/7/130739686/3978710.pdf
    • https://cdn.shopify.com/s/files/1/0429/6255/0940/files/alesis_3630_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/7196/3296/files/7819646984.pdf
    • https://cdn.shopify.com/s/files/1/0431/7682/0890/files/18113857430.pdf
    • https://cdn.shopify.com/s/files/1/0437/6153/3082/files/tuburetesosuduxu.pdf
    • https://cdn.shopify.com/s/files/1/0437/7142/9016/files/omni_salary_calculator.pdf
    • https://cdn.shopify.com/s/files/1/0430/0364/2007/files/24948043909.pdf
    • https://cdn.shopify.com/s/files/1/0436/9799/5944/files/22240252794.pdf
    • https://cdn.shopify.com/s/files/1/0436/2049/9616/files/mukisali.pdf
    • https://cdn.shopify.com/s/files/1/0432/8793/7179/files/57547136972.pdf
    • https://cdn.shopify.com/s/files/1/0431/8153/9483/files/91273972485.pdf
    • https://cdn.shopify.com/s/files/1/0434/4230/7239/files/mirazijupom.pdf
    • https://cdn.shopify.com/s/files/1/0434/4872/9766/files/importance_of_coconut_oil.pdf
    • https://cdn.shopify.com/s/files/1/0431/4038/2882/files/60060518950.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_off000065ab.bin
f7cce96342f9fdb6bbe093ec560037997a83a20ffe24d7faeaa6a4f2d2db13dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65AB 5352 bytes
font_01_sfnt_off000077b4.bin
b450039c0a1ef346dc203cf24e15002625ba4bdde2939dc247bc34edc99c2f94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77B4 10136 bytes
font_02_sfnt_off00009a76.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A76 4324 bytes

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