Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f7f1ee852028e79…

MALICIOUS

PDF

42.3 KB Created: 2020-08-11 09:21:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 04671780e7e37d369b49ef6712cd3397 SHA-1: fba8dcf80c8d767f640438f2040549d2d5a4a965 SHA-256: 5f7f1ee852028e79bb0be3b079ff17a4f6d93702aedfc4adfb17885b698f079f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious due to a high ML score and the presence of a link to known malicious redirector infrastructure. It also contains a large number of external links, many pointing to PDF files hosted on Shopify, suggesting a link farm or SEO manipulation tactic. The document body is heavily obfuscated and contains embedded URLs, but no specific script execution was detected.

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/pify?keyword=capacitor+code+guide+pdf
    • http://files.selkicasarpg.com/uploads/1/3/1/6/131637057/8beeecc57.pdf
    • http://terakuse.bourkeconstructionoc.com/uploads/1/3/1/3/131378776/sukixebojiz.pdf
    • http://files.lindawphotography.com/uploads/1/3/0/7/130775934/531b92a08.pdf
    • http://files.leslie-marshall.com/uploads/1/3/1/4/131409909/0330a57dce8b5.pdf
    • http://files.eonyoushin.com/uploads/1/3/0/7/130775588/6738246.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6558/1468/files/77070560697.pdf
    • https://cdn.shopify.com/s/files/1/0432/2128/7080/files/4653829324.pdf
    • https://cdn.shopify.com/s/files/1/0431/4939/4080/files/87926068232.pdf
    • https://cdn.shopify.com/s/files/1/0429/5560/4134/files/github_io_website.pdf
    • https://cdn.shopify.com/s/files/1/0431/6063/3504/files/zuluwibike.pdf
    • https://cdn.shopify.com/s/files/1/0437/6294/2101/files/mixture_alligation_questions.pdf
    • https://cdn.shopify.com/s/files/1/0431/5093/4173/files/7195207302.pdf
    • https://cdn.shopify.com/s/files/1/0431/1855/9389/files/61340367131.pdf
    • https://cdn.shopify.com/s/files/1/0430/2897/1674/files/64505635781.pdf
    • https://cdn.shopify.com/s/files/1/0431/4038/2882/files/4970148646.pdf
    • https://cdn.shopify.com/s/files/1/0438/4364/9698/files/zukefokamor.pdf
    • https://cdn.shopify.com/s/files/1/0430/8919/9268/files/35718777551.pdf
    • https://cdn.shopify.com/s/files/1/0435/2265/4362/files/34093309354.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069ac.bin
89441e45cc68956c5ab5788b1c7f875d56d62792798c6e9e1e82e6affff9e648		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69AC 5020 bytes
font_01_sfnt_off00007ad1.bin
d9bb4228d2c3813864684e391a921b984cd501570396fea0e30d5caf2b1ba6f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AD1 9816 bytes

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