Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3ba5819ab984fa3…

MALICIOUS

PDF

51.3 KB Created: 2021-06-08 21:27:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: fb4dda126f262c2280740aa76b1d44ec SHA-1: dfae86cfc6e7cc905d58fc538045d10a23d69394 SHA-256: a3ba5819ab984fa37d11e3b98ab96777aa85f7f7f30c70aa09c6d0224426a15a
160 Risk Score

Malware Insights

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

This PDF document contains multiple links to known malicious redirector infrastructure, specifically advertising 'free stuff' and 'game hacks'. The ML classifier also flagged this PDF as malicious. While no scripts were directly extracted, the presence of embedded URLs and the nature of the lures suggest an attempt to redirect users to potentially malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9724

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 https://netcdn.tw/app/431946152/free-stuff-roblox-lobby-game-hack In PDF document text
    • https://jogjaindotrans.com/ckfinder/userfiles/files/fbchampion_GM406889139.pdfIn PDF document text
    • https://jogjaindotrans.com/ckfinder/userfiles/files/coin-master-free-spins-ios_GM406889139.pdfIn PDF document text
    • https://jogjaindotrans.com/ckfinder/userfiles/files/rewardrobux-com_GM431946152.pdfIn PDF document text
    • https://jogjaindotrans.com/ckfinder/userfiles/files/coin-master-daily-free-spin-and-coin-link_GM406889139.pdfIn PDF document text
    • https://jogjaindotrans.com/ckfinder/userfiles/files/roblox-hax_GM431946152.pdfIn PDF document text
    • https://jogjaindotrans.com/ckfinder/userfiles/files/free-minecraft-server-maker_GM479516143.pdfIn PDF document text
    • https://jogjaindotrans.com/ckfinder/userfiles/files/coin-master-hack-ios-app_GM406889139.pdfIn PDF document text
    • https://jogjaindotrans.com/ckfinder/userfiles/files/coin-master-card-hack-2021_GM406889139.pdfIn PDF document text
    • https://jogjaindotrans.com/ckfinder/userfiles/files/free-coin-master-spins-daily_GM406889139.pdfIn PDF document text
    • https://jogjaindotrans.com/ckfinder/userfiles/files/free-spins-for-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://jogjaindotrans.com/ckfinder/userfiles/files/free-robux-scams_GM431946152.pdfIn PDF document text
    • https://jogjaindotrans.com/ckfinder/userfiles/files/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • https://jogjaindotrans.com/ckfinder/userfiles/files/download-coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://jogjaindotrans.com/ckfinder/userfiles/files/freespins-coin-master_GM406889139.pdfIn PDF document text
    • https://jogjaindotrans.com/ckfinder/userfiles/files/tiktok-likes-for-free_GM835599320.pdfIn PDF document text
    • https://jogjaindotrans.com/ckfinder/userfiles/files/how-to-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://jogjaindotrans.com/ckfinder/userfiles/files/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://jogjaindotrans.com/ckfinder/userfiles/files/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • https://jogjaindotrans.com/ckfinder/userfiles/files/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://jogjaindotrans.com/ckfinder/userfiles/files/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000515d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x515D 34552 bytes
SHA-256: 6b4b2c5f10512da15359b57600fdeb11f539d94c7b9a88104ea2ea18eeceab19
font_01_sfnt_off00009ad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9AD9 3112 bytes
SHA-256: 471f662098e83c5562504503f5e7603b336ca0957605358090bb98e15c7aed80
font_02_sfnt_off0000a592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA592 18372 bytes
SHA-256: 4c1b76aea4056719ce20d3efff49b0fdac5bac03b4c5b37eb590b2d30e9658d4

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