Malicious PDF — malware analysis report

Static analysis result for SHA-256 380a3866380fd064…

MALICIOUS

PDF

41.1 KB Created: 2020-09-03 08:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e09dfe8345c22f313c728c213de90e9a SHA-1: 0f2c3082a21ce97f8d40a6e77cd9848c8785b7c8 SHA-256: 380a3866380fd0644853f4b98e974f7ce3fd64eccaf62eafcd7077ed51e321d6
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.link/wix?keyword=camscanner+pro+apk'. This URL is presented in a way that suggests a lure for software, likely to trick users into downloading malware. The PDF also contains a mass external link farm, a common tactic for SEO poisoning to improve search engine ranking of malicious sites. The ML classifier strongly supports the malicious nature of this PDF.

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.link/wix?keyword=camscanner+pro+apk
    • https://static.usrfiles.com/ugd/2486b5_9245e58a85e4471ba50006893397b006.pdf
    • https://static.usrfiles.com/ugd/0fdb6d_f3e8d40b66a9442e8caaf9c73f7dfdb7.pdf
    • https://static.usrfiles.com/ugd/868f76_17496f639b1c41e79f628733b054b5ea.pdf
    • https://static.usrfiles.com/ugd/05900a_710b68f33f9f442eb067edcaca1e2b8c.pdf
    • https://cdn.shopify.com/s/files/1/0434/7055/3238/files/pitezogiruvo.pdf
    • https://cdn.shopify.com/s/files/1/0438/4745/0789/files/webefovinaxegopokaxelujil.pdf
    • https://cdn.shopify.com/s/files/1/0429/7015/3113/files/sikapex.pdf
    • https://cdn.shopify.com/s/files/1/0430/9755/5108/files/kavopomuwumifuruz.pdf
    • https://cdn.shopify.com/s/files/1/0429/4190/7110/files/33004851849.pdf
    • https://cdn.shopify.com/s/files/1/0439/8632/1566/files/61523531259.pdf
    • https://cdn.shopify.com/s/files/1/0429/9050/2042/files/35971070465.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_off000063bd.bin
18b422982c6e66d7c6cbad87238407ea32388c06cb746a1a13dde49e90cf80d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63BD 5016 bytes
font_01_sfnt_off000074b8.bin
393303ff0747a296976f203e60833c60ae718b0b54134596ff874ebefe913041		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74B8 10352 bytes

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