Malicious PDF — malware analysis report

Static analysis result for SHA-256 f34ef1b959066277…

MALICIOUS

PDF

47.0 KB Created: 2020-08-07 13:56:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2404ae53da4bb1002eb09b4a7df51912 SHA-1: 2c41bdb49f96962ed6bfcb7aa034857bf6c55979 SHA-256: f34ef1b95906627792e0d803147ea3b82c94af2491beec13710558dd92488af5
154 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a critical link to a known malicious redirector at `https://ttraff.cc/pify?keyword=list+of+short+vowel+words+pdf`. The document body, though heavily obfuscated, contains this URL and other Shopify links, suggesting a link farm or phishing lure. The ML classifier strongly supports the malicious verdict.

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.cc/pify?keyword=list+of+short+vowel+words+pdf
    • http://files.freedivingcompetition.com/uploads/1/3/1/4/131453633/17a061.pdf
    • http://files.islandschoolhistory.com/uploads/1/3/1/6/131637325/5742891.pdf
    • http://files.cgfcjesusislord.org/uploads/1/3/1/1/131163590/vazokixubunom.pdf
    • http://files.tripredefined.com/uploads/1/3/1/3/131383777/9423706.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zinigezumapafukutogu.pdf
    • https://cdn.shopify.com/s/files/1/0433/5150/7112/files/kufun.pdf
    • https://cdn.shopify.com/s/files/1/0438/0000/2717/files/96825082804.pdf
    • https://cdn.shopify.com/s/files/1/0434/0023/3112/files/tomogekujiguvoxemu.pdf
    • https://cdn.shopify.com/s/files/1/0435/9212/2536/files/kanye_west_heartless._mp3.pdf
    • https://cdn.shopify.com/s/files/1/0435/5719/1843/files/semi_automatic_capsule_filling_machine.pdf
    • https://cdn.shopify.com/s/files/1/0430/1049/0519/files/2248499.pdf
    • https://cdn.shopify.com/s/files/1/0437/2388/2664/files/jetizuwusapapozo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6119/0554/files/sefazisaxokulul.pdf
    • https://cdn.shopify.com/s/files/1/0432/8020/3944/files/3837763005.pdf
    • https://cdn.shopify.com/s/files/1/0433/0723/7531/files/inuyasha_the_final_act.pdf
    • https://cdn.shopify.com/s/files/1/0430/7622/3129/files/weketenodujenaxoluxuluno.pdf
    • https://cdn.shopify.com/s/files/1/0430/0052/9049/files/45547270993.pdf
    • https://cdn.shopify.com/s/files/1/0428/7329/0908/files/ribijakenigi.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_off00007a19.bin
b717cbe1dfa7cce2bc93914a08d52a5de459cc15d6aec071fcd68071857fa6e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A19 5012 bytes
font_01_sfnt_off00008b3a.bin
7546f1585bc3fb09c9bdeb0e7536953e09c820667ddb2a1f9ad2b63006a05710		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B3A 10660 bytes

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