Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3c3066c1a637147…

MALICIOUS

PDF

46.1 KB Created: 2020-07-26 01:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b0f8cc7ea94e3d05241fd536c9c0a4d5 SHA-1: 96d4155910c1a43f3e648b2aa56ddc8df650199d SHA-256: a3c3066c1a637147928fead666c59c9607a43ebbf0e42f6482ae140569062da6
150 Risk Score

Malware Insights

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

This PDF file is identified as malicious due to its use of a link farm, which contains numerous embedded URLs. One of these URLs, 'https://ttraff.ru/pify?keyword=grammar+worksheets+pdf+free', is flagged as a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to 'grammar worksheets pdf free', indicating a social engineering tactic to drive users to malicious infrastructure.

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/pify?keyword=grammar+worksheets+pdf+free
    • http://files.issimomusic.net/uploads/1/3/1/4/131407138/6030158.pdf
    • http://files.veilofyork.co.uk/uploads/1/3/0/7/130775666/2500108.pdf
    • http://files.thecreativitycore.com/uploads/1/3/0/7/130739144/6871841.pdf
    • http://files.holytemplec.org/uploads/1/3/1/4/131453598/zaxopoxudito_mogogodabuga.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nedodakamilutejevojive.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/31903895201.pdf
    • https://cdn.shopify.com/s/files/1/0428/8777/4374/files/11975169183.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71061356311.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nebedaxogatasimilore.pdf
    • https://cdn.shopify.com/s/files/1/0430/3749/1354/files/48225701137.pdf
    • https://cdn.shopify.com/s/files/1/0437/6304/0408/files/37770278187.pdf
    • https://cdn.shopify.com/s/files/1/0434/4607/5542/files/dujokegutasu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nunirisolifugonogebivaxez.pdf
    • https://cdn.shopify.com/s/files/1/0438/0193/6033/files/fadirisavo.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_off00006f8f.bin
b1c3526cf090172d4ccc94aa724e55f07eeeb95288dce68c3a8b9ca29cc95ffe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F8F 5072 bytes
font_01_sfnt_off000080e5.bin
3f898564c1844f5f35b446ebdb84ad0f7cb267b0541280257077d5f883ee0f13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80E5 13796 bytes

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