Malicious PDF — malware analysis report

Static analysis result for SHA-256 f43a002eb75d200c…

MALICIOUS

PDF

56.0 KB Created: 2020-08-19 06:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7b678054229f287c9a6aaae9ecae04f SHA-1: 4d38dba73a4a196882097ab63a401b832e41a88d SHA-256: f43a002eb75d200cc1f4758a2f0b3436b2244b8e0e9d22760bf44c20c7ef2f21
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 pointing to a link farm hosted on Shopify, and one critical link to a known malicious redirector at 'ttraff.ru'. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=appointment+scheduling+app+android', suggesting a lure related to 'appointment scheduling app android'. The ML classifier strongly flagged this PDF as malicious, and the presence of a redirector link indicates an attempt to lead the user to malicious infrastructure.

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=appointment+scheduling+app+android
    • http://files.guardiangrouptravel.com/uploads/1/3/1/4/131406811/1498498.pdf
    • http://bojekiz.mikkimono.net/uploads/1/3/1/0/131069934/588861.pdf
    • http://files.jeskare.com/uploads/1/3/0/7/130775653/komimirozaga-kakuwu-wazokepajaxuwol.pdf
    • https://cdn.shopify.com/s/files/1/0436/1139/0115/files/banking_royal_commission_interim_report.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/93336639176.pdf
    • https://cdn.shopify.com/s/files/1/0436/4576/3744/files/99866865842.pdf
    • https://cdn.shopify.com/s/files/1/0427/6004/4710/files/gewederuderunefoba.pdf
    • https://cdn.shopify.com/s/files/1/0428/0870/5187/files/ap_calculus_textbook_10th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0437/6163/1389/files/wekewugoxo.pdf
    • https://cdn.shopify.com/s/files/1/0432/6716/2276/files/21520126650.pdf
    • https://cdn.shopify.com/s/files/1/0433/8837/1107/files/94108100496.pdf
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/zapomofegabavabuse.pdf
    • https://cdn.shopify.com/s/files/1/0433/9495/7475/files/bts_butterfly_album.pdf
    • https://cdn.shopify.com/s/files/1/0432/3019/9966/files/jagenerefogaso.pdf
    • https://cdn.shopify.com/s/files/1/0432/5851/1522/files/android_wear_watch_faces_apk.pdf
    • https://cdn.shopify.com/s/files/1/0438/0642/5249/files/dupuvibixorijagobefora.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_off00009d27.bin
48c4b2ce58501fe9d8d1d9c2029823507416c7b4e020e37d8bbd690406ba7cd7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D27 5476 bytes
font_01_sfnt_off0000af8d.bin
232e3e37842835393a10eb07037ba792aad985059cb01fb00b6006d2c07f2e40		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF8D 10472 bytes

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