Malicious PDF — malware analysis report

Static analysis result for SHA-256 820ca5e9c32b4f83…

MALICIOUS

PDF

43.2 KB Created: 2021-05-19 12:40:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 5377ec94f1ec0ea23f85987e695da47c SHA-1: 536c2bcf0771103f212212f7e7bedd33487fad6b SHA-256: 820ca5e9c32b4f83e90d199c5da0f36102dbd253e8695d2b992651c4e22b87ee
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a known malicious redirector, disguised as game hacks and free currency generators. The document body and embedded links strongly suggest a phishing or scam attempt to drive traffic to malicious infrastructure. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/free-robux-without-human-verification-game-hack In PDF document text
    • http://bob-reid.co.uk/uploads/files/files/como-hackear-el-juego-coin-master_GM406889139.pdfIn PDF document text
    • http://bob-reid.co.uk/uploads/files/files/pubg-uc-list_GM1330123889.pdfIn PDF document text
    • http://bob-reid.co.uk/uploads/files/files/roblox-prison-life-hack_GM431946152.pdfIn PDF document text
    • http://bob-reid.co.uk/uploads/files/files/microsoft-rewards-robux_GM431946152.pdfIn PDF document text
    • http://bob-reid.co.uk/uploads/files/files/free-roblox-templates_GM431946152.pdfIn PDF document text
    • http://bob-reid.co.uk/uploads/files/files/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://bob-reid.co.uk/uploads/files/files/rbx-roblox-robux_GM431946152.pdfIn PDF document text
    • http://bob-reid.co.uk/uploads/files/files/coin-master-free-100-spin-link_GM406889139.pdfIn PDF document text
    • http://bob-reid.co.uk/uploads/files/files/roblox-sued_GM431946152.pdfIn PDF document text
    • http://bob-reid.co.uk/uploads/files/files/coin-master-hacks-free-spins_GM406889139.pdfIn PDF document text
    • http://bob-reid.co.uk/uploads/files/files/coin-master-daily-free-spins-link-march-2021_GM406889139.pdfIn PDF document text
    • http://bob-reid.co.uk/uploads/files/files/coin-master-free-spin-realme-products_GM406889139.pdfIn PDF document text
    • http://bob-reid.co.uk/uploads/files/files/coin-master-free-link_GM406889139.pdfIn PDF document text
    • http://bob-reid.co.uk/uploads/files/files/how-to-get-free-robux-on-pc_GM431946152.pdfIn PDF document text
    • http://bob-reid.co.uk/uploads/files/files/microsoft-store-robux_GM431946152.pdfIn PDF document text
    • http://bob-reid.co.uk/uploads/files/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://bob-reid.co.uk/uploads/files/files/coin-master-hacks-that-actually-work_GM406889139.pdfIn PDF document text
    • http://bob-reid.co.uk/uploads/files/files/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • http://bob-reid.co.uk/uploads/files/files/how-to-make-a-private-server-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://bob-reid.co.uk/uploads/files/files/free-roblox-hack-us_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_off000049f6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49F6 25268 bytes
SHA-256: 6431ddbae393ba9cd1c5bb8fc23f1e9fda6c260d687c9d94ec86146ab14dc601
font_01_sfnt_off00008401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8401 19224 bytes
SHA-256: 69162c0303826e3a88150cee7b6b12b50ba56e04bc46253c0e5eb9f80ac8a399

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