Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d52df4ece89b23f…

MALICIOUS

PDF

39.1 KB Created: 2020-08-19 16:09:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d21fd6d7091f1d38cd917ae576fafa8e SHA-1: 0550c1ba5249dc4a9ee65382ebd05ab834520920 SHA-256: 4d52df4ece89b23f2f7de70204339dd1c84fa6c8e232898d753a8956818e24f6
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used to obscure the final destination of the malicious payload. The document also hosts a large number of external PDF links, many pointing to Shopify domains, suggesting a link farm or SEO poisoning tactic to increase visibility. The ML classifier strongly indicated maliciousness.

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=adjectives+with+ed+or+ing+worksheets
    • http://files.theclassicknowledge.com/uploads/1/3/1/3/131383456/notodewof.pdf
    • http://files.liverpooliti.com/uploads/1/3/0/7/130776787/tofifep_maxaxemubowug.pdf
    • https://cdn.shopify.com/s/files/1/0438/9571/8040/files/1095231464.pdf
    • https://cdn.shopify.com/s/files/1/0431/7662/4279/files/99696490282.pdf
    • https://cdn.shopify.com/s/files/1/0432/5795/4467/files/gogotumibatale.pdf
    • https://cdn.shopify.com/s/files/1/0430/8133/4933/files/91594727670.pdf
    • https://cdn.shopify.com/s/files/1/0431/6728/5408/files/gafed.pdf
    • https://cdn.shopify.com/s/files/1/0429/6769/5511/files/elementos_del_genero_lirico.pdf
    • https://cdn.shopify.com/s/files/1/0435/7311/7087/files/jaws_book.pdf
    • https://cdn.shopify.com/s/files/1/0434/2611/9831/files/70808103195.pdf
    • https://cdn.shopify.com/s/files/1/0430/0436/2906/files/88866460494.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tagesagebog.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_off00005ac5.bin
6beff91f97ce42611532cf0e3075c8fe2d052fb2db4aac95369cceeaaa2b9978		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AC5 5240 bytes
font_01_sfnt_off00006cad.bin
8217590c9cf12eb8a40a11ff998535f357729036e1ceebc077da2783b1fc9e0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CAD 10356 bytes

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