Malicious PDF — malware analysis report

Static analysis result for SHA-256 18922b49c85b8ab0…

MALICIOUS

PDF

44.3 KB Created: 2020-09-01 07:29:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5940580c64a9788f6cf9dcdb7cc8c4a9 SHA-1: 5792098a5504a7e51f428c8176e0d816aec0868e SHA-256: 18922b49c85b8ab06db393102a8fc030bc14d20d16a8dcc14aa919e2372c97e4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded links, many of which point to Shopify-hosted PDFs, likely as a tactic to appear legitimate. However, one critical link directs to a known malicious redirector at 'ttraff.ru'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to the malicious URL and a benign-looking Shopify URL, suggesting a lure to a malicious site.

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/wix?keyword=bit+web+server+paid+apk
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/1293/2255/files/2108356697.pdf
    • https://cdn.shopify.com/s/files/1/0429/2804/6233/files/kutililamebubemivutukejo.pdf
    • https://cdn.shopify.com/s/files/1/0430/5698/8311/files/94964549852.pdf
    • https://cdn.shopify.com/s/files/1/0432/4386/4228/files/befuvajuwejidagamejuvo.pdf
    • https://cdn.shopify.com/s/files/1/0434/4535/4658/files/numberformat_php_not_working.pdf
    • https://cdn.shopify.com/s/files/1/0432/1699/4466/files/gosidedaverexaligubeko.pdf
    • https://cdn.shopify.com/s/files/1/0432/5516/9186/files/wibiwus.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/78030006053.pdf
    • https://cdn.shopify.com/s/files/1/0434/6550/6966/files/99675113351.pdf
    • https://cdn.shopify.com/s/files/1/0435/5312/8612/files/north_coast_real_estate_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/2652/9956/files/arap_bahar_ve_trkiye.pdf
    • https://cdn.shopify.com/s/files/1/0431/7321/6411/files/13449726334.pdf
    • https://cdn.shopify.com/s/files/1/0435/9523/5490/files/86392106998.pdf
    • https://cdn.shopify.com/s/files/1/0433/7460/8545/files/aradhana_all_songs_pagalworld.pdf
    • https://cdn.shopify.com/s/files/1/0434/0645/9032/files/fasuluzawo.pdf
    • https://cdn.shopify.com/s/files/1/0429/8915/8554/files/sekudepowonaselanuwafat.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_off0000698a.bin
91b47d45ab6094d200182717cd74053b4850f6d2a7cca7b6cfc5d6657106e715		 pdf-font-stream PDF embedded font (sfnt) at offset 0x698A 5324 bytes
font_01_sfnt_off00007bc7.bin
c8d51e747c50e3f0ecf898d0143d4223c226bc2a2f58f5fa177f8f7e7ed04e09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BC7 12804 bytes

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