Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9f393cb5932d876…

MALICIOUS

PDF

33.8 KB Created: 2021-06-26 08:16:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d192cdf93858dc80cd3c2dd178f1dd52 SHA-1: 382da4881db1332c806937effd5293834299fdbd SHA-256: a9f393cb5932d876f15df49b1368fd01b6b018d45b179900f193fdbf54f662ea
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to external websites, including a known malicious redirector at http://netcdn.co/app/431946152/how-to-get-free-robux-2021-no-hack-game-hack. The document body and heuristic firings indicate a lure for free Robux or game hacks, a common social engineering tactic. The presence of embedded URLs and the ML classifier's high confidence score suggest malicious intent.

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/how-to-get-free-robux-2021-no-hack-game-hack In PDF document text
    • http://library.stembi.ac.id/repository/roblox-free-robux-but-not-a-scam_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/free-robux-hack-no-survey-no-downloading-no-pasting_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/bux-life-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/free-robux-survey_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/lazyblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/free-tiktok-fans-and-likes_GM835599320.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/how-to-download-roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/free-alts-roblox_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/get-free-robux-info_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/roblox-hack-scripts-pastebin_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/how-to-get-20210-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/roblox-cheat-gdn_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/minecraft-free-download-pc_GM479516143.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/free-robux-hack-generator-club-no-survey_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/roblox-jailbreak-auto-arrest-hack_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/free-tiktok-likes-trial_GM835599320.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/robux-maker-free-download_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/how-to-hack-into-peoples-accounts-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002eb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EB9 21412 bytes
SHA-256: c1d2bc63409a9b6bd3bbc275d141ace2127abcaf93638d5bf91c9fd5eb236711
font_01_sfnt_off00005d82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D82 19556 bytes
SHA-256: 64a1c3f97224bd0b38ea5adbf3084abff4008b9adb4dc97d4d2a0069f11511c0

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