Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aad78e677ee18d6…

MALICIOUS

PDF

57.5 KB Created: 2020-08-06 01:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f85e5de4f3e42ec7321544123f8ebef2 SHA-1: d18365039b6602da2e1f44e5fe4193bb66775e78 SHA-256: 4aad78e677ee18d659885990a7296efed217dd96cfb7b25ef41dccb396e7d4d9
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains multiple embedded links, with one critical heuristic identifying a link to a known malicious redirector at 'ttraff.ru'. This redirector is likely used to obscure the final malicious destination. The PDF also exhibits characteristics of a link farm, with numerous links pointing to various domains, many of which are hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The presence of the malicious redirector URL and the ML classification indicate a high likelihood of a phishing or malware delivery attempt.

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=assembly+language+for+x86+processors+kip+irvine+pdf
    • http://files.stmildreds.org.uk/uploads/1/3/0/8/130813528/f83d651c64.pdf
    • http://files.southaustinseafoodrestaurant.com/uploads/1/3/0/8/130874361/e43f13572755.pdf
    • http://wotizu.totemsathletics.ca/uploads/1/3/1/8/131856318/faseporowuvot.pdf
    • http://files.bluedotbeadwork.com/uploads/1/3/1/4/131438570/zitavimig.pdf
    • http://files.dbked.com/uploads/1/3/1/3/131381363/e86f003.pdf
    • https://cdn.shopify.com/s/files/1/0430/1661/8145/files/blank_html_template.pdf
    • https://cdn.shopify.com/s/files/1/0431/4267/6648/files/dinadabubulilas.pdf
    • https://cdn.shopify.com/s/files/1/0434/6681/7689/files/narosobofiwafizasa.pdf
    • https://cdn.shopify.com/s/files/1/0439/0522/0763/files/pexaxuzetotuwedikarepew.pdf
    • https://cdn.shopify.com/s/files/1/0430/7527/2855/files/ponibanelaxajofu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9313/1425/files/77644044513.pdf
    • https://cdn.shopify.com/s/files/1/0437/3712/0933/files/tibusisezibuf.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rejumaxerufu.pdf
    • https://cdn.shopify.com/s/files/1/0439/9949/4302/files/20053434335.pdf
    • https://cdn.shopify.com/s/files/1/0428/7925/4694/files/4967685758.pdf
    • https://cdn.shopify.com/s/files/1/0439/2668/3816/files/4946174446.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_off0000940a.bin
08945b7f9baec515c56d4e3642770b1a4ba737b081d9e13e7c58a55f4b8f9776		 pdf-font-stream PDF embedded font (sfnt) at offset 0x940A 6244 bytes
font_01_sfnt_off0000a941.bin
54a713d56f04a7d1be7c2e05f23abfd9db443fe8c3ad7de07b4b4d531d708998		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA941 15220 bytes

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