Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9c8a07da1efaf71…

MALICIOUS

PDF

36.3 KB Created: 2021-06-20 20:50:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: a6d0bbcd725ac81f942e1a20caf513b4 SHA-1: bb531db59c3f59a428ce3083475807041d2a723a SHA-256: a9c8a07da1efaf716474f9a5a0578e3b295698c7c175bb342163948972cdc362
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector, disguised as a 'game hack' or 'free generator' lure. The primary URL http://netcdn.co/app/431946152/how-to-hack-any-roblox-account-june-2021-game-hack is identified as a malicious redirector by multiple heuristics. The document body text and embedded URLs reinforce this lure, aiming to trick users into clicking through to potentially malicious sites. 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.co/app/431946152/how-to-hack-any-roblox-account-june-2021-game-hack In PDF document text
    • https://www.mpos-organs.com/uploads/files/files/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
    • https://www.mpos-organs.com/uploads/files/files/how-can-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.mpos-organs.com/uploads/files/files/coin-master-tricks-and-hacks_GM406889139.pdfIn PDF document text
    • https://www.mpos-organs.com/uploads/files/files/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • https://www.mpos-organs.com/uploads/files/files/roblox-t-shirt-free_GM431946152.pdfIn PDF document text
    • https://www.mpos-organs.com/uploads/files/files/minecraft-windows-10-key-free_GM479516143.pdfIn PDF document text
    • https://www.mpos-organs.com/uploads/files/files/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • https://www.mpos-organs.com/uploads/files/files/fake-hacker-in-roblox_GM431946152.pdfIn PDF document text
    • https://www.mpos-organs.com/uploads/files/files/who-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.mpos-organs.com/uploads/files/files/minecraft-rtx-download-free_GM479516143.pdfIn PDF document text
    • https://www.mpos-organs.com/uploads/files/files/rbx-place-free-robux_GM431946152.pdfIn PDF document text
    • https://www.mpos-organs.com/uploads/files/files/coin-master-hack-mod-apk-free-download_GM406889139.pdfIn PDF document text
    • https://www.mpos-organs.com/uploads/files/files/grabpoints-robux_GM431946152.pdfIn PDF document text
    • https://www.mpos-organs.com/uploads/files/files/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.mpos-organs.com/uploads/files/files/minecraft-xray-hack_GM479516143.pdfIn PDF document text
    • https://www.mpos-organs.com/uploads/files/files/coin-master-free-spins-link-download-hack_GM406889139.pdfIn PDF document text
    • https://www.mpos-organs.com/uploads/files/files/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
    • https://www.mpos-organs.com/uploads/files/files/booga-booga-in-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://www.mpos-organs.com/uploads/files/files/free-robux-gift-cards-live-now_GM431946152.pdfIn PDF document text
    • https://www.mpos-organs.com/uploads/files/files/pokemon-go-free-balls-code_GM1094591345.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_002_off00003169.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3169 23508 bytes
SHA-256: b9b2c7eecabf3592aaf091f5d5c0983421ce63d414da2971093f7d915e83bca6
font_01_sfnt_off00006664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6664 19812 bytes
SHA-256: be31ca7029a8f85ad6b764cbd488a89dfcd48c59cdde40f408cc62e0eaa021a3

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