Malicious PDF — malware analysis report

Static analysis result for SHA-256 857ef54578ec714b…

MALICIOUS

PDF

34.7 KB Created: 2021-07-04 19:47:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: aae33ae1f3427e95a13bd7b79a4c5607 SHA-1: 81297d2a2830d0b34cdc7566a7c7673100ec92aa SHA-256: 857ef54578ec714b9293ef791cc81a1df60cd5d42354446f8aabcdc6fb8e219b
160 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs and a heuristic firing for a visual download button, suggesting a lure to download potentially malicious content. The document body and URLs indicate a theme of game hacks and cheats, specifically for Robux, which is a common social engineering tactic. The ML classifier also strongly flagged this PDF as malicious.

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/how-to-get-free-robux-as-a-kid-game-hack In PDF document text
    • http://slims.abulyatama.ac.id/repository/how-to-use-free-robux-cheat-codes_GM431946152.pdfIn PDF document text
    • http://slims.abulyatama.ac.id//repository/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/dragon-ball-advanced-battle-roblox-hack_GM431946152.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/roblox-speed-simulator-2-hack_GM431946152.pdfIn PDF document text
    • http://slims.abulyatama.ac.id//repository/coin-master-free-spins-2021-ios_GM406889139.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/coin-master-20-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/coin-master-hack-without-verify_GM406889139.pdfIn PDF document text
    • http://slims.abulyatama.ac.id//repository/free-minecraft-svg-cutting-files_GM479516143.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/roblox-best-outfits-free_GM431946152.pdfIn PDF document text
    • http://slims.abulyatama.ac.id//repository/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/roblox-download-ios-free_GM431946152.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/pubg-uc-ycom_GM1330123889.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/roblox-games-com-free_GM431946152.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/can-you-make-shirts-free-on-roblox_GM431946152.pdfIn PDF document text
    • http://slims.abulyatama.ac.id//repository/coin-master-free-spins-hack-2021_GM406889139.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/roblox-bc-free-trial_GM431946152.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/how-to-get-infinite-robux_GM431946152.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/free-promo-codes-list-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_off00002efc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EFC 22612 bytes
SHA-256: 8bc27dc0a88de0d9d77c0def0a36bf4841ad01ac25ec54205c523915a6a5ea15
font_01_sfnt_off000061a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61A3 19280 bytes
SHA-256: fbd482d3b42c402f31899b7174a93de7a7aa833796ffa593885741fefeb30eca

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