Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cfa7d776981f64c…

MALICIOUS

PDF

36.0 KB Created: 2020-08-28 23:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 274f27942a5c2f8ac443781158bc3142 SHA-1: 18e0bd3720d25590502ad468133baff05653f501 SHA-256: 4cfa7d776981f64c37aa3237b0beae4d9e6028e4b9f363ff969544e28e9da980
154 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. Another critical heuristic identified a large PDF link farm, suggesting a potential SEO poisoning or phishing campaign. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, and the document body is heavily obfuscated, but the presence of numerous links to a redirector is a strong indicator of malicious intent.

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/wix?keyword=arikil+pathiye+karaoke
    • https://cdn.shopify.com/s/files/1/0429/8558/6849/files/wodamanunodafipusanulor.pdf
    • https://cdn.shopify.com/s/files/1/0447/7734/1079/files/cambridge_english_pronunciation_dictionary_apk.pdf
    • https://cdn.shopify.com/s/files/1/0432/6785/0390/files/natoju.pdf
    • https://cdn.shopify.com/s/files/1/0433/0881/0398/files/60396926775.pdf
    • https://cdn.shopify.com/s/files/1/0434/2874/1272/files/10331178867.pdf
    • https://static.usrfiles.com/ugd/b8c837_5f200ab4ebdb4b10b98f773635ebf639.pdf
    • https://static.usrfiles.com/ugd/b8c837_5b2e3296347541adbc8f1a04cf718a93.pdf
    • https://static.usrfiles.com/ugd/b8c837_fe4db59a38d34125ab614f0278647cb5.pdf
    • https://static.usrfiles.com/ugd/b8c837_0675bf0d342c4dc788b86726e2943cd5.pdf
    • https://static.usrfiles.com/ugd/b8c837_f20e34dc86bb4b579029d044e266d776.pdf
    • https://cdn.shopify.com/s/files/1/0433/5091/7269/files/chicken_invader_3.pdf
    • https://cdn.shopify.com/s/files/1/0433/5108/1114/files/71092720438.pdf
    • https://cdn.shopify.com/s/files/1/0459/6229/7504/files/pomuwoni.pdf
    • https://cdn.shopify.com/s/files/1/0432/4917/2643/files/bpsc_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0437/0133/8266/files/oxford_discover_2_workbook.pdf
    • https://cdn.shopify.com/s/files/1/0439/4899/8811/files/topix_brinkley_ar.pdf
    • https://cdn.shopify.com/s/files/1/0428/9314/8313/files/lujopunazimot.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_off00004d3f.bin
476a3e2020b76611074aa3c7e8926efcfabb8e4a805e62eadd67c111ac7d6b3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D3F 4884 bytes
font_01_sfnt_off00005dd2.bin
90b3aea50b8419eaf06d792955d770bc1b3a905dedb06ce665345a595c999f96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DD2 11756 bytes

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