Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0dc53e6a7769937…

MALICIOUS

PDF

43.5 KB Created: 2021-05-19 13:40:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 786a5d8cf4b229b0c8517144a842ab43 SHA-1: e31a15718eb080d67cf225b0587ec1dc7b8a7c29 SHA-256: d0dc53e6a7769937880f2d2f971b800585016dc4b2ade4811deb6fdb0d360ee8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to malicious infrastructure, specifically promoting 'game hacks' and 'free currency' lures. The heuristic firings confirm these links point to known malicious redirectors and a game hack lure. While no scripts were explicitly extracted, the nature of the PDF and its embedded links suggests an attempt to drive users to malicious sites, likely for further exploitation or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

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.xyz/app/406889139/coin-master-hacks-no-human-verification-game-hack In PDF document text
    • http://unilin21.ru/images/coin-master-club-hack_GM406889139.pdfIn PDF document text
    • http://unilin21.ru/images/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/free-robux-generator-codes_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/robux-hack-me_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/free-robux-obby-2021_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/roblox-shirt-template-free_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/roblox-com-free-play_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/how-to-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/minecraft-linux-free_GM479516143.pdfIn PDF document text
    • http://unilin21.ru/images/como-hackear-coin-master_GM406889139.pdfIn PDF document text
    • http://unilin21.ru/images/plug-toolbox-for-minecraft-free-ios_GM479516143.pdfIn PDF document text
    • http://unilin21.ru/images/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/roblox-got-talent-piano-hack_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/coin-master-free-spins-and-coins-link-haktuts_GM406889139.pdfIn PDF document text
    • http://unilin21.ru/images/coin-master-mod-apk_GM406889139.pdfIn PDF document text
    • http://unilin21.ru/images/free-robux-download_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/hack-coin-master-with-lucky-patcher_GM406889139.pdfIn PDF document text
    • http://unilin21.ru/images/coin-master-daily-free-spins-and-coins-2021_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_003_off000048fd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48FD 24040 bytes
SHA-256: 6a9c3323a295bf1e8f32e7c04e4061954489267aef47cea4001d20ccf5c53084
font_01_sfnt_off00007d73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D73 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off0000875e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x875E 18248 bytes
SHA-256: b53d611e96a32094425b068729023046bb1db9f19d10500fe1599e8fd30759af

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