Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1bfbef6230d3339…

MALICIOUS

PDF

49.4 KB Created: 2020-08-13 11:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33f4e4e0ca295dba9fd2ea18b38cdd2a SHA-1: bffe56a8c4cd48334d6121eab92034e208d0c4e0 SHA-256: c1bfbef6230d3339906bf8103e49a9bb95e30af9c66bf0153c4def0e82686978
152 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, specifically pointing to 'ttraff.cc'. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm strategy to obscure the malicious destination. The ML classifier also strongly flagged this PDF as malicious.

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.cc/pify?keyword=btec+level+3+national+sport+book+1+pdf
    • http://files.adventfair.co.za/uploads/1/3/1/3/131383657/7239462.pdf
    • http://files.kharupetiacollege.org/uploads/1/3/2/6/132695543/dabepi-vibepesetaje-depefelugeko-fitixefovalom.pdf
    • http://files.nlacademy.net/uploads/1/3/2/7/132740949/nuzefabasef_vokek_nubaxinib.pdf
    • http://lomat.ceramicnano.net/uploads/1/3/1/4/131408899/527c3a99c6.pdf
    • https://cdn.shopify.com/s/files/1/0430/8120/3861/files/71388212470.pdf
    • https://cdn.shopify.com/s/files/1/0435/0020/8294/files/aluminium_alloys_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/4210/2679/files/brief_publicitario_libro.pdf
    • https://cdn.shopify.com/s/files/1/0430/5790/5818/files/fuludiromulojowul.pdf
    • https://cdn.shopify.com/s/files/1/0432/3724/5085/files/ferajorasod.pdf
    • https://cdn.shopify.com/s/files/1/0429/5327/7589/files/59460917897.pdf
    • https://cdn.shopify.com/s/files/1/0432/7879/4917/files/9665017798.pdf
    • https://cdn.shopify.com/s/files/1/0435/0086/3643/files/python_bind_function.pdf
    • https://cdn.shopify.com/s/files/1/0437/7994/8695/files/bhagavad_gita_lyrics_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0427/8039/3639/files/gavin_arvizo_now.pdf
    • https://cdn.shopify.com/s/files/1/0429/0212/6751/files/99999171755.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067f9.bin
a7c7738a4d891873e5dd82423c32c25e13145742f7a9056fafc70318434246d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67F9 7396 bytes
font_01_sfnt_off000080fc.bin
60acc44b4d5ee551cb129cd108264a79f8fc80aeee97fe97d6cebe49d60114db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80FC 5676 bytes
font_02_sfnt_off0000945e.bin
44245c5598a24f15465f7bde49dd250ca102a216b3126030808a9f8d7edfa58f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x945E 10364 bytes

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