Malicious PDF — malware analysis report

Static analysis result for SHA-256 16455063c950f116…

MALICIOUS

PDF

41.8 KB Created: 2020-08-02 14:29:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a19c4a9cb5e7ce31a9e4de4a5fcc70b9 SHA-1: 988ffa79819084579248a53a131ea0ca2de97cdc SHA-256: 16455063c950f116c78bb980574f413358e2ace3db6ef96a4199c5827c5bf865
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=ssh+net+example', suggesting a lure to download or navigate to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=ssh+net+example
    • http://files.budavet.net/uploads/1/3/1/6/131636678/jixufirin-vatejiwor.pdf
    • http://files.papamadeitwoodworking.com/uploads/1/3/0/7/130740536/ridelesamomipebised.pdf
    • http://files.merarifernandez.com/uploads/1/3/1/4/131407165/6839308.pdf
    • http://files.helpbuildit.net/uploads/1/3/1/4/131409498/tawufufikowa_vevojuvijogej_kefepuj_silorixi.pdf
    • http://files.conejoroyals.com/uploads/1/3/1/6/131606697/setatidivumoraj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/0379/7913/files/kefaneker.pdf
    • https://cdn.shopify.com/s/files/1/0429/2732/5343/files/18105564263.pdf
    • https://cdn.shopify.com/s/files/1/0428/2079/6583/files/pisemakaniv.pdf
    • https://cdn.shopify.com/s/files/1/0430/7946/7162/files/array_length_javascript.pdf
    • https://cdn.shopify.com/s/files/1/0433/8289/8840/files/raduvij.pdf
    • https://cdn.shopify.com/s/files/1/0431/4549/4684/files/85324991814.pdf
    • https://cdn.shopify.com/s/files/1/0433/5714/3205/files/47123153325.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/13164506765.pdf
    • https://cdn.shopify.com/s/files/1/0436/6322/9078/files/31204911959.pdf
    • https://cdn.shopify.com/s/files/1/0436/5202/2430/files/laxefugenojepitugapawu.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065c9.bin
4d3e9a364f5fac568dd40967f9a7e0a22e814389d8ff43bdee2a77a53a3743b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65C9 5132 bytes
font_01_sfnt_off0000771c.bin
400d0410c8be84c76e25d9ef7dc4a6a3d812e239b1413e831f18bf780aa82301		 pdf-font-stream PDF embedded font (sfnt) at offset 0x771C 10460 bytes

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