Malicious PDF — malware analysis report

Static analysis result for SHA-256 e54433a47a10ddc8…

MALICIOUS

PDF

51.7 KB Created: 2020-08-19 04:50:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 220419d07e484d04c150ff7070a74340 SHA-1: cb8cfbfa8046015fffa91ed4b2e3eb52db6f746a SHA-256: e54433a47a10ddc88d3535c61da1f42f27cb8efbd3c1d974887e4842a8bddeab
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. Additionally, it exhibits characteristics of a PDF link farm, with numerous links to external PDFs, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL and references to a game, suggesting a lure for malicious redirection.

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=8+ball+pool+club+game
    • http://sujumodi.lightcodesmusic.com/uploads/1/3/0/7/130775403/zobakobofotevo-govewuto.pdf
    • http://files.z-lips.com/uploads/1/3/1/3/131383760/5396036.pdf
    • http://files.arc-hcs.com/uploads/1/3/1/4/131455158/dazefabugepajav.pdf
    • http://files.osteopathyrmtrelief.com/uploads/1/3/0/8/130814120/jodefulixuwimeb.pdf
    • https://cdn.shopify.com/s/files/1/0435/2563/6248/files/67497242934.pdf
    • https://cdn.shopify.com/s/files/1/0432/4828/7912/files/articles_exercises_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/0416/5285/files/gavelelipugagelixebaro.pdf
    • https://cdn.shopify.com/s/files/1/0427/9340/2534/files/radatikobolifarobukinivo.pdf
    • https://cdn.shopify.com/s/files/1/0440/5103/8358/files/99873200333.pdf
    • https://cdn.shopify.com/s/files/1/0431/1393/9110/files/23991207951.pdf
    • https://cdn.shopify.com/s/files/1/0434/1317/6469/files/brushless_excitation_system.pdf
    • https://cdn.shopify.com/s/files/1/0436/1555/1645/files/bubegixuxuzizofolazizezaz.pdf
    • https://cdn.shopify.com/s/files/1/0431/6859/6123/files/basic_automotive_parts.pdf
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/xasodebilosemukazorilos.pdf
    • https://cdn.shopify.com/s/files/1/0431/8052/3678/files/9544521283.pdf
    • https://cdn.shopify.com/s/files/1/0437/1018/5637/files/xevivokawup.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_off00008b8f.bin
bab039aae766a54c626008f5e35250a131e58d775a034362a91c634bb413ed3c
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B8F 5216 bytes
font_01_sfnt_off00009d33.bin
714701234786cbc17d0363bb24fc161492f1c443b2d36cfb1f68e5832605d83e
pdf-font-stream PDF embedded font (sfnt) at offset 0x9D33 10820 bytes