Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a98ddfae7efa1a8…

MALICIOUS

PDF

38.2 KB Created: 2021-07-04 18:56:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 977199479854aeb068df30184a73a59e SHA-1: 5f6eb885caea2b14ff18ac4bf98ec656b1193838 SHA-256: 7a98ddfae7efa1a846536b9b096366a3e68ce3bb2534d471e805fea6447847db
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains an external URI pointing to a site offering free Robux hacks, indicating a phishing or scam attempt. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs further supports a malicious intent. While no scripts were explicitly extracted, the nature of the lure suggests it aims to redirect users to download malicious content or visit further phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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/431946152/show-me-how-to-get-free-robux-game-hack In PDF document text
    • https://www.sarsen.net/uploads/files/files/roblox-people-getting-passes-for-free_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/coin-master-play-online-free_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/wizard-life-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/roblox-unban-hack_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/roblox-free-music_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/haktuts-coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/free-robux_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/hacks-de-roblox-para-todos-los-juegos_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/adfly-hack-roblox_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/free-stuff-game-roblox_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/coin-master-hack-apk-android-1_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/simple-roblox-hack-hp_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/coin-master-free-coins-spins_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/how-to-load-cheat-scripts-in-roblox_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/coin-master-hack-mod-apk-free-download_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/free-robux-for-kids-no-verification_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/how-to-get-1-million-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/free-coin-master-gifts_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/roblox-free-robux-2021-pc_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_off00003bc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3BC8 23132 bytes
SHA-256: 00ba204f7ec20c618cbd4e94aaafbbbad90c6422b596fbac8ac66957bdbb9332
font_01_sfnt_off00006fdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FDD 19348 bytes
SHA-256: d26d04a97ef4ef1984db51a9dbb6ae7fe4887511724be7c0a10401d3a20c9a41

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