Malicious PDF — malware analysis report

Static analysis result for SHA-256 96c9322deb7db1df…

MALICIOUS

PDF

38.9 KB Created: 2021-05-21 03:14:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 461b69a73ee9c55c88da23dbfae3353e SHA-1: 8530537380a16f8dd97e1ab90cc7a544a3b567b6 SHA-256: 96c9322deb7db1df6c290d395b6e37d5d3d99cd491cb2d41295204e740919993
200 Risk Score

Malware Insights

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

The PDF contains multiple links to malicious redirectors, including one for a 'free generator / game hack' and another that displays a fake CAPTCHA. These elements are designed to trick the user into clicking through to a potentially malicious site. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to exploit user curiosity for malicious purposes, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9476

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/what-games-on-roblox-give-you-free-robux-game-hack In PDF document text
    • http://electro-nrg.com/images/how-to-get-free-robux-fast_GM431946152.pdfIn PDF document text
    • http://electro-nrg.com/images/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://electro-nrg.com/images/free-downloads-for-coin-master-daily-rewards_GM406889139.pdfIn PDF document text
    • http://electro-nrg.com/images/free-attacks-on-coin-master_GM406889139.pdfIn PDF document text
    • http://electro-nrg.com/images/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000344d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x344D 27964 bytes
SHA-256: ba41df46588f2e6bd9961985c3d8096609bafc996f95bcf4893577306d886959
font_01_sfnt_off00007368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7368 19440 bytes
SHA-256: d075b9cdfa29af0d09f3a3e5cc134cf400d7d34255e3ca0094b6ab529e7e4150

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