Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7d44a0b801f8188…

MALICIOUS

PDF

45.5 KB Created: 2021-06-10 23:24:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 71f5420f5cbc430818a5770c78d56497 SHA-1: 44f08107602e21c90bffd3890579ee125024c605 SHA-256: f7d44a0b801f8188fc9a930eae0d330ffc6599b6b4a386ef7dd27438ffbd9a74
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising 'game hacks' and 'robux generators'. The primary malicious link identified is https://netcdn.tw/app/431946152/wearedevs-roblox-exploits--game-hack, which is designed to lure users into clicking. The document body, though partially corrupted, contains references to this lure and embedded URLs, suggesting a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.tw/app/431946152/wearedevs-roblox-exploits--game-hack In PDF document text
    • http://labfisika.undiksha.ac.id/perpustakaan//repository/free-robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • http://labfisika.undiksha.ac.id/perpustakaan/repository/robux-codes_GM431946152.pdfIn PDF document text
    • http://labfisika.undiksha.ac.id/perpustakaan//repository/coin-master-free-soins_GM406889139.pdfIn PDF document text
    • http://labfisika.undiksha.ac.id/perpustakaan/repository/free-attacks-coin-master_GM406889139.pdfIn PDF document text
    • http://labfisika.undiksha.ac.id/perpustakaan//repository/regal-world-coin-master_GM406889139.pdfIn PDF document text
    • http://labfisika.undiksha.ac.id/perpustakaan//repository/online-coin-master-hack-here_GM406889139.pdfIn PDF document text
    • http://labfisika.undiksha.ac.id/perpustakaan//repository/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://labfisika.undiksha.ac.id/perpustakaan/repository/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • http://labfisika.undiksha.ac.id/perpustakaan//repository/real-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://labfisika.undiksha.ac.id/perpustakaan/repository/easy-points-gg_GM431946152.pdfIn PDF document text
    • http://labfisika.undiksha.ac.id/perpustakaan//repository/legit-coin-master-hack-october-2021_GM406889139.pdfIn PDF document text
    • http://labfisika.undiksha.ac.id/perpustakaan//repository/minecraft-ps4-free_GM479516143.pdfIn PDF document text
    • http://labfisika.undiksha.ac.id/perpustakaan/repository/roblox-lcoins-hack_GM431946152.pdfIn PDF document text
    • http://labfisika.undiksha.ac.id/perpustakaan//repository/daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://labfisika.undiksha.ac.id/perpustakaan/repository/gain-free-robux_GM431946152.pdfIn PDF document text
    • http://labfisika.undiksha.ac.id/perpustakaan/repository/robuxhub-net_GM431946152.pdfIn PDF document text
    • http://labfisika.undiksha.ac.id/perpustakaan/repository/how-to-get-roebucks-in-roblox_GM431946152.pdfIn PDF document text
    • http://labfisika.undiksha.ac.id/perpustakaan/repository/free-robux-gen_GM431946152.pdfIn PDF document text
    • http://labfisika.undiksha.ac.id/perpustakaan/repository/minecraft-coins-free_GM479516143.pdfIn PDF document text
    • http://labfisika.undiksha.ac.id/perpustakaan//repository/rbx-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_004_off000050df.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50DF 25988 bytes
SHA-256: ea7d7d36237166b397264b443038c9dba00772c5d8ec220f4668249d5b6f25ce
font_01_sfnt_off00008d15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D15 18896 bytes
SHA-256: 45426cbd94e0fec2dbf9bcb1bd4f3971845e8675d7d3c3be3565a7418c35fb94

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