Malicious PDF — malware analysis report

Static analysis result for SHA-256 74c4acdcb39b4732…

MALICIOUS

PDF

41.2 KB Created: 2021-05-14 05:08:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 34ce74cc93b9c74e76dc4c39ae99c48c SHA-1: 636a5a506604683a55434fd921af2be164b22f14 SHA-256: 74c4acdcb39b47329e36420d68f796330ecf40aa38d08efa748c6b13995aae44
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and infrastructure, disguised as a lure for free Robux or game hacks. The heuristic firings confirm the malicious redirector links and the lure nature of the document. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site, 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/431946152/to-get-free-robux-game-hack In PDF document text
    • http://bufbd.org/images/robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://bufbd.org/images/80-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://bufbd.org/images/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • http://bufbd.org/images/how-to-hack-coin-master-game-2021_GM406889139.pdfIn PDF document text
    • http://bufbd.org/images/free-robux-offers_GM431946152.pdfIn PDF document text
    • http://bufbd.org/images/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://bufbd.org/images/roblox-rape-hack_GM431946152.pdfIn PDF document text
    • http://bufbd.org/images/microsoft-roblox-rewards_GM431946152.pdfIn PDF document text
    • http://bufbd.org/images/roblox-phantom-forces-hack_GM431946152.pdfIn PDF document text
    • http://bufbd.org/images/coin-master-free-spins-2021-link_GM406889139.pdfIn PDF document text
    • http://bufbd.org/images/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://bufbd.org/images/free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://bufbd.org/images/free-spins-coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://bufbd.org/images/coin-master-free-spins-link-no-verification-code_GM406889139.pdfIn PDF document text
    • http://bufbd.org/images/free-roblox-money_GM431946152.pdfIn PDF document text
    • http://bufbd.org/images/free-robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • http://bufbd.org/images/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://bufbd.org/images/how-to-get-free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://bufbd.org/images/real-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://bufbd.org/images/roblox36com-free-robux_GM431946152.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_off000045db.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x45DB 24764 bytes
SHA-256: 67ddbd475b24e045214b2a80e7ca5fd44e6af36405c752ca772fad46f6a52b21
font_01_sfnt_off00007ee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EE0 18120 bytes
SHA-256: 5233d5aad1bcdd77905869674ceee15891b0fc77671f16174d37808cf9f58ee1

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