Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca2bc877289f7921…

MALICIOUS

PDF

39.2 KB Created: 2020-08-26 03:27:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cfeadb2bc7ee4fe55b2012cc61d8db8c SHA-1: 03ca0ed95d7222c2d13b9b58d5960ea105a25249 SHA-256: ca2bc877289f7921089c27f8a005de53c659ee505645989311ae5d9329b7bdf5
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to potentially malicious redirectors or link farms. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a URL leading to 'ttraff.club', indicating a redirection attempt. The ML classifier also strongly suggests 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.club/pify?keyword=ford+autonation+memphis
    • http://files.absolutept-sg.com/uploads/1/3/0/7/130739315/852537.pdf
    • http://vifodu.mesheacrysup.com/uploads/1/3/0/7/130776508/vumepub.pdf
    • http://xidap.hamptonlinks.org/uploads/1/3/1/3/131383407/9567850.pdf
    • http://files.delaneype.com/uploads/1/3/1/4/131407625/kakori_namexelinu_zelalezulok.pdf
    • http://zafemefil.jayantiyoga.com/uploads/1/3/0/8/130814172/3767216.pdf
    • https://cdn.shopify.com/s/files/1/0436/4949/9289/files/43704011411.pdf
    • https://cdn.shopify.com/s/files/1/0434/6835/7796/files/character_reference_letter_for_immigration.pdf
    • https://cdn.shopify.com/s/files/1/0429/7955/7535/files/catalogo_vimar_2020.pdf
    • https://cdn.shopify.com/s/files/1/0439/2599/5688/files/diary_rewards_osrs.pdf
    • https://cdn.shopify.com/s/files/1/0435/1698/5503/files/degosuwefowos.pdf
    • https://cdn.shopify.com/s/files/1/0429/2807/9004/files/barclays_mortgage_deed.pdf
    • https://cdn.shopify.com/s/files/1/0437/0812/1242/files/tunigawitujataw.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_off00005bc5.bin
a4e0f19244383d123200e3bb6fd85b1f01c47fe734fc59ac71a9ea265a8b693c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BC5 5120 bytes
font_01_sfnt_off00006d05.bin
8262f5e7bb46beba1ef19ddc5a8c70f8a23bcc41e4d959050fccbdd6cd8b5a22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D05 10300 bytes

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