Malicious PDF — malware analysis report

Static analysis result for SHA-256 abf21f714136f995…

MALICIOUS

PDF

40.8 KB Created: 2021-05-21 06:39:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 923bb549e5f674e62a2d70de433d352c SHA-1: c3ae273d05b2ba8214515392d10ba25d6d354ff1 SHA-256: abf21f714136f9955bfa6d30c3545a97b43e502254858faebb8c14e5cc45a4be
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains embedded links that redirect to malicious infrastructure, masquerading as game hacks or generators. It also presents a fake CAPTCHA to trick users into executing further actions. The ML classifier also flagged this PDF as malicious, supporting the observed malicious behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7445

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • 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.
  • 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
  • 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
  • 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://netcdn.xyz/app/431946152/how-to-make-a-roblox-group-for-free-game-hack In PDF document text
    • https://gaj.rs/images/coin-master-free-spins-link-june-2021_GM406889139.pdfIn PDF document text
    • https://gaj.rs/images/lazyblocks-com-robux_GM431946152.pdfIn PDF document text
    • https://gaj.rs/images/blogspot-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://gaj.rs/images/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://gaj.rs/images/roblox-free-pets_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000346f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x346F 25080 bytes
SHA-256: 084bcc34adbcdbb670bb19063a0b6197d8c3288afbb23fb0963cca6c612eaf19
font_01_sfnt_off00006e87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E87 4008 bytes
SHA-256: 515da38a799acdefd039af3a0dfb6ec4815b572058c9bd492ec5a77cd7658593
font_02_sfnt_off00007c12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C12 19020 bytes
SHA-256: d86a0664516f84ca778de604dc8f5b6c02622b942defeefdc42ca528d3381c5a

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