Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a3c937553f4746f…

MALICIOUS

PDF

42.8 KB Created: 2020-08-31 00:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 98e9773dfd38f3b602e8f001bdd039bd SHA-1: 8e1b81de914e1b9c70b7a75b38d18ff4ee0a7342 SHA-256: 1a3c937553f4746f8dde91e630189f128b32905672db255fa294ed24907c86aa
150 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs. One critical heuristic identified a link to a known malicious redirector, 'ttraff.ru'. The document body, though partially corrupted, contains text related to legal documents and the malicious URL, suggesting a lure to trick users into clicking the malicious link. The presence of a large number of external PDF links further supports the attack pattern of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/wix?keyword=zayi+belgesi+dava+dilek%25C3%25A7esi+%25C3%25B6rne%25C4%259Fi
    • https://cdn.shopify.com/s/files/1/0432/5592/2856/files/nixokewuwudafob.pdf
    • https://cdn.shopify.com/s/files/1/0433/0625/4494/files/bupemipimaxanijuwaje.pdf
    • https://cdn.shopify.com/s/files/1/0434/5063/0296/files/zojijenepilifilola.pdf
    • https://cdn.shopify.com/s/files/1/0434/8516/7766/files/dijovus.pdf
    • https://cdn.shopify.com/s/files/1/0462/4328/3104/files/rental_bond_lodgement_form_fair_trading.pdf
    • https://static.usrfiles.com/ugd/d78803_9929dbe5bfe34d3ebd6f7c13bd3fd88c.pdf
    • https://static.usrfiles.com/ugd/04e6f9_3a67f73df7a349f9a6ecb1cd9e22494c.pdf
    • https://static.usrfiles.com/ugd/ca300b_0b9fdd1f02fc4822ba5245dae96da776.pdf
    • https://static.usrfiles.com/ugd/9b7d8a_d1c362ac6f9f4e6fa078b05d4fb7d0b9.pdf
    • https://static.usrfiles.com/ugd/0779a3_359dc0bc4dcd418a882387ce866210cc.pdf
    • https://static.usrfiles.com/ugd/5a1791_2eeca294b6184d5ebe120270b88eb457.pdf
    • https://static.usrfiles.com/ugd/7d1dc9_79e9abbd7d86454990df4bf2ae834083.pdf
    • https://static.usrfiles.com/ugd/4d6844_cbc088ac1f5c424bb8dcbcecc103a59f.pdf
    • https://cdn.shopify.com/s/files/1/0447/5482/9463/files/19221220025.pdf
    • https://cdn.shopify.com/s/files/1/0433/7886/8387/files/physiology_textbook_ak_jain.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_off00006325.bin
3449f96658cdaebc71931f097a92e2df3690d72886779e7bdb66f6a6f48c3513		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6325 5864 bytes
font_01_sfnt_off00007689.bin
b0bbd0cad16a5ec763b89627c4f1c4d02a5580a859255aa89c2299187ac4e359		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7689 12320 bytes

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