Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d421f57ed646ef9…

MALICIOUS

PDF

33.9 KB Created: 2021-07-03 20:59:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 17a12d74897977a18e9f5c54972d5737 SHA-1: 5b29aa633a2c6e7f5b05c63a0eac7472d0087a6e SHA-256: 1d421f57ed646ef9f0ef7cf7006b1f18dd6dc0e4dc417abe1e18fd502d95c52b
160 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a game hack redirect lure, pointing to malicious infrastructure. The document body also contains the same malicious URL, reinforcing the lure. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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/roblox-free-items-game-hack In PDF document text
    • https://opac.itp.ac.id/repository/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/coin-master-hack-2021-iphone_GM406889139.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/robux-pastebin-hack_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/free-things-in-roblox-2021_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/boku-no-roblox-cheat-engine_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/coin-master-free-stuff_GM406889139.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/good-uniform-making-software-free-roblox_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/free-100-robux_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/dracosword-roblox-hacker_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/cheating-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/how-to-get-frre-robux-hack_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/when-was-minecraft-free_GM479516143.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/roblox-cbro-cheat-spots_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/robux-free-c_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/how-do-you-get-the-ability-to-hack-in-roblox_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/roblox-blood-moon-tycoon-hack-v3rmillion_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/coin-master-free-pet-food_GM406889139.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/one-punch-man-unleashed-roblox-hack-cheat-engine_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/free-robux-t-shirt_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/maverick-cheats-roblox_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_off00002d96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D96 22504 bytes
SHA-256: e6c1b3407665eaececec93d5105480c2e246cc5098deb3e122080a921017167a
font_01_sfnt_off00005fa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FA2 19016 bytes
SHA-256: c20a3ccfd5d3fb630a1125d5ffd2660ec8ecf265c8f5669b913cc8ebfc1d3802

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