Malicious PDF — malware analysis report

Static analysis result for SHA-256 62be625ff21c5a21…

MALICIOUS

PDF

41.8 KB Created: 2020-09-18 04:39:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 378a007514ef9c457276c6d61a32597c SHA-1: 4cb1ac5bab3a8b2180db370930fbd610985d7af1 SHA-256: 62be625ff21c5a217e18ee2d51360c9b89169323a3140244c222753352303bb5
242 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a fake CAPTCHA and a browser extension installation lure, designed to trick users into clicking links. These links lead to malicious redirector infrastructure, specifically identified as 'ttraff.me', which likely serves as a gateway to further malicious content or exploits. The ML classifier strongly flagged this PDF as malicious, supporting the observed social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.me/wix?keyword=bypass+survey+remover+online
    • http://files.carolteitelbaum.com/uploads/1/3/2/6/132681245/0d6877a17e2b.pdf
    • http://pomov.midgard-merchandise.com/uploads/1/3/1/8/131871479/70b25fd9.pdf
    • http://bener.grasslaketrafficjamin.com/uploads/1/3/0/8/130814328/68893.pdf
    • http://files.theplotterprincess.com/uploads/1/3/0/8/130815115/1005713.pdf
    • http://judazodu.bluecornconsultingllc.com/uploads/1/3/0/9/130969937/tebumowe-nuzisisesip.pdf
    • http://fexurob.shelbyveterinaryservice.com/uploads/1/3/0/7/130776783/ca35eeb19b.pdf
    • http://bavebup.lakecountyiltransition.com/uploads/1/3/1/4/131438539/9653562.pdf
    • http://zijadat.portlandroseballoons.com/uploads/1/3/0/7/130739723/3021603.pdf
    • http://files.caspirparanormal.org/uploads/1/3/0/7/130776484/mefamafifa_xolizad_pubudezenej_fiten.pdf
    • http://files.ukopedestal.com/uploads/1/3/1/4/131407921/fozonarame-tisapaduwubodo-bukavafowinapo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d410f35c-37d3-4da4-a3c3-92e5a38b3508.filesusr.com/ugd/66f3f9_d5ca08a3371042cda5e879356c5dc0a9.pdf?index=true
    • https://1b6d3389-b3f0-4d55-9116-267924eea4e1.filesusr.com/ugd/07e02c_15dec5da92e4469a960c9fa1297cd585.pdf?index=true
    • https://44b2dcdc-983e-4966-9578-072bf223e5f0.filesusr.com/ugd/665c20_28a748affa6c428c98ae7f4095cbdf92.pdf?index=true
    • https://eade8b6a-75fe-4ef9-8ea8-fed313f00616.filesusr.com/ugd/f523c3_605c1bc675e44c738a51b10f0bc57067.pdf?index=true
    • 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_off00006732.bin
96ce04c8fbc5ca1a7eeb27134171cfb6464c097fd0bcc40e84c75b1202859c5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6732 5176 bytes
font_01_sfnt_off000078c3.bin
f7cd728ec4619e45bbaaac67a9cb7b9141f929545b439bf472cf2068d4ab363e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78C3 9908 bytes

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