Malicious PDF — malware analysis report

Static analysis result for SHA-256 998c998fba661db7…

MALICIOUS

PDF

34.0 KB Created: 2021-07-05 23:22:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: f429375d8a9b6e22938e34d1d732fa31 SHA-1: 1ca6a9c1c6e40d84f64d806bebbf35ca7d3dfe69 SHA-256: 998c998fba661db7335a0bb050c281b0860b5bb075cb856e422d9bb3543c4f8f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to known malicious infrastructure, specifically promoting game hacks and cheats. The document body and heuristics indicate a lure for free game currency or hacks, designed to trick users into visiting these malicious sites. The presence of embedded URLs and the ML classifier strongly suggest malicious intent, likely as a phishing or redirection campaign.

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.tw/app/406889139/coin-master-cracked-apk-free-download-game-hack In PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/free-spins-for-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/blox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/pokemon-go-hack-free-coins_GM1094591345.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/roblox-premium-hacks_GM431946152.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/free-robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/free-panda-mask-roblox_GM431946152.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/if-roblox-got-hacked_GM431946152.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/roblox-dragon-riders-hack_GM431946152.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/free-robux-frebruary-2021_GM431946152.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/coinmaster-spin-ml_GM406889139.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/roblox-btools-hack_GM431946152.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/earn-rbx_GM431946152.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/how-to-get-free-robux-no-download-2021_GM431946152.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/counter-blox-roblox-offensive-hack-download_GM431946152.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/coin-master-hacks-no-verification_GM406889139.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/earn-free-robux-today_GM431946152.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/download-coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/get-2021-robux-free_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
font_00_sfnt_off00002f92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F92 21924 bytes
SHA-256: 662ff470c09a9120050e2c859363633de06c6a5966dabb66bd7aaa933573cc8a
font_01_sfnt_off00006015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6015 18924 bytes
SHA-256: 55716a7eef5342f175226249442460552699f57233d89bd721837c942058d113