Malicious PDF — malware analysis report

Static analysis result for SHA-256 a728253bc4b5a6d3…

MALICIOUS

PDF

32.3 KB Created: 2021-07-19 18:00:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 7400c23b8e799afa49a6e9c8af806d1c SHA-1: b52c2e03396e1b689869e39ee26f5ffac22509ba SHA-256: a728253bc4b5a6d3615c78052f0e9a0d60e9f7328f5e8a52782a5ee55f6d56ad
168 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a critical heuristic firing indicates it links to known malicious redirector infrastructure. The document body and extracted URLs suggest a lure for 'free Robux' or game hacks, which redirects to a URL associated with malicious activity. This pattern is consistent with a malicious document designed to exploit user interest in free in-game currency or cheats to deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://netcdn.tw/app/431946152/free-robux-codes-game-hack In PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/minecraft-svg-free_GM479516143.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/free-robux-no-download_GM431946152.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/free-robux-easy_GM431946152.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/minecraft-education-edition-free_GM479516143.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/free-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/free-minecraft-codes_GM479516143.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/robux-hack-generator_GM431946152.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/free-robux-link_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
font_00_sfnt_off000028be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28BE 22780 bytes
SHA-256: 3d68b4a2152bed3922b617d4c3d6965f8490a85f9c43263a3bcc1075de669175
font_01_sfnt_off00005bb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BB6 18372 bytes
SHA-256: ebd16bed473c0d10154cd721ddc212c44ce3f73d33b4848c8fd41fc41acf3798

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