Malicious PDF — malware analysis report

Static analysis result for SHA-256 16a75aa8177277cc…

MALICIOUS

PDF

34.7 KB Created: 2021-07-06 07:43:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 1f49adf04b9b521091b75048dd505657 SHA-1: 15ec4b92d4886d9de660fafb6b055b6e99d00df3 SHA-256: 16a75aa8177277cc157d0bd662bfa2f27b2150737572b7b4049b2fd8e9358447
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'game hacks' and 'free currency' for popular games. The primary redirector URL is http://netcdn.tw/app/406889139/coin-master-online-hack-download-game-hack. This lure is designed to trick users into downloading potentially unwanted or malicious software. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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/406889139/coin-master-online-hack-download-game-hack In PDF document text
    • http://smpn1sda.sch.id/slims/repository/haktuts-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/how-to-get-robux_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/1x1x1x1-roblox-id_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/coins-master_GM406889139.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/rewardrobux-com_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/roblox-best-games-free_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/roblox-free-robux-mod_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/how-to-get-the-chill-turtle-on-roblox-free_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/coin-master-free-spins-1-coin-master_GM406889139.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/robuxlove-net-free-robux_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/how-to-get-minecraft-for-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/no-scam-free-robux_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/orocash-free-robux_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/woman-roblox_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/freerobux-hack-us_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/easy-free-robux-today_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/april-fools-hack-2021-roblox_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/coin-and-spin-link_GM406889139.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/minecraft-alt-accounts-free_GM479516143.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_off00003001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3001 23048 bytes
SHA-256: 37b2551ce77056b3399ec2175a30fad0540d9d1f41be72044f3b7f773e9e6160
font_01_sfnt_off000063d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63D9 18584 bytes
SHA-256: 4f39a964c2369815dd095da972cd285e5cbfadd70784a90c0ed9ed1783704710