Malicious PDF — malware analysis report

Static analysis result for SHA-256 a33edd56ad75171b…

MALICIOUS

PDF

48.3 KB Created: 2020-08-09 11:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8deace6224d2829e6db5ca01fc9b389 SHA-1: 78e7a26e1e5b8392172647809835d2192c4f2166 SHA-256: a33edd56ad75171b9ac0c77d19a34a37234045441d5aa84322545a3dd63f649c
152 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, embedding a significant number of external URLs. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=materi+amdal+smk+pdf'. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the same malicious URL and several benign-looking Shopify URLs, suggesting a lure to obscure the malicious intent. No scripts were extracted from this sample.

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.ru/pify?keyword=materi+amdal+smk+pdf
    • http://files.metrograniteokc.com/uploads/1/3/0/7/130775916/2016f12e.pdf
    • http://zabuzerom.sammactavish.ca/uploads/1/3/1/1/131164250/4fd74f13e.pdf
    • http://files.alexander-shalimov.com/uploads/1/3/0/8/130813866/1904018.pdf
    • http://files.tac-teams.com/uploads/1/3/0/7/130740433/belaxusawunu.pdf
    • https://cdn.shopify.com/s/files/1/0437/5180/0981/files/66694932003.pdf
    • https://cdn.shopify.com/s/files/1/0435/5502/9141/files/irs_form_6198.pdf
    • https://cdn.shopify.com/s/files/1/0436/8603/5621/files/sukikowo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/69892687871.pdf
    • https://cdn.shopify.com/s/files/1/0429/7129/9999/files/download_firefox_for_mac.pdf
    • https://cdn.shopify.com/s/files/1/0429/1022/0447/files/44041524523.pdf
    • https://cdn.shopify.com/s/files/1/0431/7813/1611/files/signing_naturally_units_7-_12.pdf
    • https://cdn.shopify.com/s/files/1/0434/5420/2013/files/kalabhairava_ashtakam_lyrics_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0440/6693/0840/files/kepuvowej.pdf
    • https://cdn.shopify.com/s/files/1/0437/2650/4086/files/73458788475.pdf
    • https://cdn.shopify.com/s/files/1/0433/4885/2894/files/zero_negative_and_rational_exponents_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/8642/9861/files/2105980075.pdf
    • https://cdn.shopify.com/s/files/1/0430/5544/8213/files/audit_report_of_an_existing_company.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_off00007e4d.bin
bb0535728be539ebff7683f23c4667e405ad4f0388864a461133b63f90762852		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E4D 5256 bytes
font_01_sfnt_off00009025.bin
3eb691ee2deb7349402a47ac4d2f8d390828c7f4461cc5c2ae11141d1fd6ce57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9025 10196 bytes

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