Malicious PDF — malware analysis report

Static analysis result for SHA-256 7303b6870978cce6…

MALICIOUS

PDF

80.5 KB Created: 2020-08-20 21:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 694b1be6d4439f1aff63fc1c21915421 SHA-1: b158828751f8a7f1161dd8b10f1e6b3acc6b7a01 SHA-256: 7303b6870978cce6773401dd58df374d61e355001348c51604f4539186cc1723
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, with a critical heuristic firing indicating it's a redirector link farm pointing to malicious infrastructure. The primary malicious URL identified is 'https://ttraff.ru/pify?keyword=latex+bibliography+change+format', which is presented to the user as a resource for LaTeX formatting. While no scripts were extracted, the PDF structure and embedded links strongly suggest a phishing or redirection attempt, likely delivered as a spearphishing attachment.

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=latex+bibliography+change+format
    • http://duwoj.davidthornberry.com/uploads/1/3/0/7/130775403/4144107.pdf
    • http://dolom.hoosiertractionmeet.com/uploads/1/3/2/7/132741555/defijemajufeje.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/9746/3714/files/65001950528.pdf
    • https://cdn.shopify.com/s/files/1/0429/9377/8837/files/zexugobuke.pdf
    • https://cdn.shopify.com/s/files/1/0433/6903/7980/files/49870047088.pdf
    • https://cdn.shopify.com/s/files/1/0434/7405/9430/files/61614816213.pdf
    • https://cdn.shopify.com/s/files/1/0433/4452/7525/files/87649164140.pdf
    • https://cdn.shopify.com/s/files/1/0436/3422/9401/files/fapapafiliwigipomedagivu.pdf
    • https://cdn.shopify.com/s/files/1/0443/8360/0806/files/social_cognitive_approach_to_learning.pdf
    • https://cdn.shopify.com/s/files/1/0435/9897/1038/files/giputumepuvodagom.pdf
    • https://cdn.shopify.com/s/files/1/0440/8626/3960/files/kitixexokapabijaresogol.pdf
    • https://cdn.shopify.com/s/files/1/0432/3350/9534/files/48958757949.pdf
    • https://cdn.shopify.com/s/files/1/0427/5834/0774/files/zazoxalusulavapipawubal.pdf
    • https://cdn.shopify.com/s/files/1/0437/3259/8938/files/act_fibernet_login.pdf
    • https://cdn.shopify.com/s/files/1/0432/8806/8254/files/rumumi.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f92a.bin
651464c7f584eebbdf53243a33b1f0ab1e08c06d303b288abd2cb7e2300dc92f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF92A 5504 bytes
font_01_sfnt_off00010bcb.bin
2ea8c0410bd5c09a9fe914505118599c67b95a533d7be8ffc2153f72df9ad9ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCB 11948 bytes

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