Malicious PDF — malware analysis report

Static analysis result for SHA-256 31dd9f539d57c02d…

MALICIOUS

PDF

33.3 KB Created: 2021-06-19 00:16:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: ba81eabaa9eac6d4afacaf50b08276cd SHA-1: e7f9d8417326266f4bdd897657a2eb74eb009f26 SHA-256: 31dd9f539d57c02d10409e4e8d12bf775a42c28d8e82ecb9174ba017fd13aeed
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and websites offering game hacks and generators, indicating a lure for users to download further malicious content or visit phishing sites. The heuristic firings strongly suggest malicious redirector infrastructure and a lure-based attack pattern. No scripts were extracted from this sample, but the embedded URLs are the primary indicators of compromise.

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/guess-the-logo-cheat-on-roblox-game-hack In PDF document text
    • http://grabmyinfo.com/images/coin-master-app-hack_GM406889139.pdfIn PDF document text
    • http://grabmyinfo.com/images/mcpe-master-coin-hack-apk_GM406889139.pdfIn PDF document text
    • http://grabmyinfo.com/images/5-roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://grabmyinfo.com/images/how-to-get-a-free-minecraft-server_GM479516143.pdfIn PDF document text
    • http://grabmyinfo.com/images/pokemon-go-free-candy_GM1094591345.pdfIn PDF document text
    • http://grabmyinfo.com/images/free-minecraft-thumbnails_GM479516143.pdfIn PDF document text
    • http://grabmyinfo.com/images/roblox-free-hair-codes_GM431946152.pdfIn PDF document text
    • http://grabmyinfo.com/images/how-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://grabmyinfo.com/images/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://grabmyinfo.com/images/como-ser-hacker-en-roblox-en-grand-blox-auto_GM431946152.pdfIn PDF document text
    • http://grabmyinfo.com/images/how-to-cheat-in-roblox-with-scriptss_GM431946152.pdfIn PDF document text
    • http://grabmyinfo.com/images/how-to-hack-coin-master-spin-ios_GM406889139.pdfIn PDF document text
    • http://grabmyinfo.com/images/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://grabmyinfo.com/images/how-to-fix-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://grabmyinfo.com/images/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://grabmyinfo.com/images/free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://grabmyinfo.com/images/instagram-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://grabmyinfo.com/images/slurp-roblox-hack_GM431946152.pdfIn PDF document text
    • http://grabmyinfo.com/images/free-robux-no-human-verify-or-download-2021_GM431946152.pdfIn PDF document text
    • http://grabmyinfo.com/images/2021-free-spins-coin-master_GM406889139.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_off00002c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C59 22368 bytes
SHA-256: cf37814819ce1d3006db1e782ddf1755f336669802dd34c38898d3b1d5ac5ead
font_01_sfnt_off00005e10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E10 18708 bytes
SHA-256: 190699a8a76f1312714f72f331533cdd8e0872d67fc92f71848b05123992991b

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