Malicious PDF — malware analysis report

Static analysis result for SHA-256 baff91609c2bc452…

MALICIOUS

PDF

40.7 KB Created: 2020-08-22 20:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fcf18646e3b53b5ff12cb5cc5e84b7d9 SHA-1: de0f5f445a88d7eebdaf994409cb0b68f875540e SHA-256: baff91609c2bc4521213f585a6001f2911d799e96515969b2d66b23be0c78aec
152 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The embedded URLs point to infrastructure known for malicious activity, specifically 'ttraff.ru'. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the suspicious URL, suggesting an attempt to disguise the 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/pify?keyword=shell+alvania+g3+pdf
    • http://mokeju.eartharkbotswana.com/uploads/1/3/1/4/131483245/5513673.pdf
    • http://bovokav.preserveatspringknoll.com/uploads/1/3/1/3/131378985/9228728.pdf
    • https://cdn.shopify.com/s/files/1/0438/6488/3355/files/1537428691.pdf
    • https://cdn.shopify.com/s/files/1/0440/0722/7542/files/discord_text_size.pdf
    • https://cdn.shopify.com/s/files/1/0435/7141/3155/files/office_administrative_assistant_resume.pdf
    • https://cdn.shopify.com/s/files/1/0428/8030/3270/files/76497847016.pdf
    • https://cdn.shopify.com/s/files/1/0448/3108/0605/files/tratamiento_amebiasis_pediatria.pdf
    • https://cdn.shopify.com/s/files/1/0431/3179/7668/files/sozixumulavurazizu.pdf
    • https://cdn.shopify.com/s/files/1/0438/8706/7291/files/ludajudopetavixod.pdf
    • https://cdn.shopify.com/s/files/1/0429/9508/9559/files/vexusodufenovivesabaxoma.pdf
    • https://cdn.shopify.com/s/files/1/0428/1637/2892/files/31892794122.pdf
    • https://cdn.shopify.com/s/files/1/0434/0819/5736/files/tazevorimi.pdf
    • https://cdn.shopify.com/s/files/1/0436/6693/1865/files/installing_kali_linux.pdf
    • https://cdn.shopify.com/s/files/1/0433/9620/2652/files/bingo_printable_cards_template.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_off00005325.bin
1b27e5704082e4d981a551a6b90de30c372626b1bfae30c93eb2def504573c44
pdf-font-stream PDF embedded font (sfnt) at offset 0x5325 5356 bytes
font_01_sfnt_off00006561.bin
4f5d357a51db66c65e1210892169fb2963c1d225bb93169142c88f5cee7ca32a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6561 15160 bytes