Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3a3153220232791…

MALICIOUS

PDF

64.6 KB Created: 2020-07-31 19:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23cf74b7cf4d416015f52126809c883d SHA-1: b690c6907d8a33cc5f29c752667b480335a283dd SHA-256: f3a315322023279186dbecbf3080700d38848c6cf1e162dc40720fb9a118c766
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass external link farm, with one link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=csgo+autoexec+commands', suggesting a lure related to gaming commands to entice clicks. The ML classifier strongly flagged this PDF as malicious, supporting the presence of malicious content. No scripts were extracted, limiting the analysis of specific execution behaviors.

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=csgo+autoexec+commands
    • http://files.suffah.in/uploads/1/3/1/3/131380547/1192257.pdf
    • http://files.lakelore.com/uploads/1/3/2/6/132682899/31c57a5ae707d65.pdf
    • http://files.farmingdaleadultdaycare.org/uploads/1/3/0/9/130969053/5a9971d8.pdf
    • http://files.roc-secure.co.uk/uploads/1/3/0/8/130874543/8721347.pdf
    • http://files.omanroadshow.com/uploads/1/3/0/7/130776182/da712092f62c6.pdf
    • https://cdn.shopify.com/s/files/1/0436/8770/6774/files/rudukuxidemelatelelep.pdf
    • https://cdn.shopify.com/s/files/1/0430/7861/5189/files/xodotowu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gibowutobarifokegibig.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/walezilufotalenuzodumis.pdf
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/81894299546.pdf
    • https://cdn.shopify.com/s/files/1/0429/6769/5509/files/popolok.pdf
    • https://cdn.shopify.com/s/files/1/0430/4669/9165/files/gevijibosi.pdf
    • https://cdn.shopify.com/s/files/1/0429/5180/3039/files/xumadolulasoguwadiludafid.pdf
    • https://cdn.shopify.com/s/files/1/0431/3962/9218/files/49745131834.pdf
    • https://cdn.shopify.com/s/files/1/0430/4958/2743/files/12715545300.pdf
    • https://cdn.shopify.com/s/files/1/0440/7151/8373/files/pamapufabaxepejebomika.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_off0000b389.bin
583385b2cd5cccf2f469358f25ffc293fba805d5b4f1dae422fee49555924271		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB389 5056 bytes
font_01_sfnt_off0000c4b0.bin
0b91f7399770e4adb2588dd5ea80c0dfd82f4c876d7afa6b024633b599e8873d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4B0 10112 bytes
font_02_sfnt_off0000e742.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE742 4324 bytes

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