Malicious PDF — malware analysis report

Static analysis result for SHA-256 77503e0d9182b0b9…

MALICIOUS

PDF

41.4 KB Created: 2021-05-14 02:39:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: cad619efc5fd9c3f7e177a2dbe02c1f4 SHA-1: 6b6ce625a0e6e3dace235bbc690e723c796c42d1 SHA-256: 77503e0d9182b0b92a5439778f015bb7fd869d55af74ce57c38cc473ef4c4d8e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirector infrastructure, specifically designed to lure users with promises of free in-game currency and hacks. The heuristic firings confirm the malicious nature of these links and the overall document. The document body and embedded URLs suggest a social engineering tactic to drive traffic to potentially malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/free-coins-and-spins-in-coin-master-game-hack In PDF document text
    • https://au-ma.com/image/data/files/play-coin-master-online-free_GM406889139.pdfIn PDF document text
    • https://au-ma.com/image/data/files/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/free-coins-coin-master-haktuts_GM406889139.pdfIn PDF document text
    • https://au-ma.com/image/data/files/coin-master-heaven-daily-free-spins_GM406889139.pdfIn PDF document text
    • https://au-ma.com/image/data/files/how-to-earn-free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • https://au-ma.com/image/data/files/free-minecraft-printables_GM479516143.pdfIn PDF document text
    • https://au-ma.com/image/data/files/legit-coin-master-hack-site-zyngaplayerforumscom_GM406889139.pdfIn PDF document text
    • https://au-ma.com/image/data/files/coin-master-free-spins-link-2021-download_GM406889139.pdfIn PDF document text
    • https://au-ma.com/image/data/files/free-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • https://au-ma.com/image/data/files/free-roblox-scripts_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/minecraft-gun-mod-download-free_GM479516143.pdfIn PDF document text
    • https://au-ma.com/image/data/files/free-robux-mobile_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/oprewards-com-robux_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/best-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://au-ma.com/image/data/files/real-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/rbx-land-free-robux_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/link-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://au-ma.com/image/data/files/free-coin-master-spins-daily_GM406889139.pdfIn PDF document text
    • https://au-ma.com/image/data/files/how-to-get-free-hats-on-roblox_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/coin-master-cheat-engine-hack_GM406889139.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
stream_003_off0000492f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x492F 23956 bytes
SHA-256: 922e1f9735e9936d4306c6aa994a8b388e826ff90881378eb829eb31fa3cbf21
font_01_sfnt_off00008028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8028 18060 bytes
SHA-256: 1b3bc7270dc207897a9e5e1a55cf6ed9cf064fa4c4c77d14f396411fde3b81d9

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