Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9288ddf6f37f5c7…

MALICIOUS

PDF

34.2 KB Created: 2021-07-04 16:13:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 6b966fe6413443bff378c8d60013bbc5 SHA-1: 3d318382895534b31a2892e509243bbe84a0eb3c SHA-256: f9288ddf6f37f5c7a8a2c7906db9f967b666aecd85479567a63678f67f78fdf5
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including a critical redirector to 'earnrobux-game-hack', which is indicative of a phishing or scam lure. The document body and heuristics suggest a focus on fake game hacks and generators to trick users into visiting malicious sites. No scripts were extracted from this sample, but the embedded URLs and link farm structure strongly suggest a malicious redirection workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/earnrobux-game-hack In PDF document text
    • https://perpus.uwhs.ac.id/repository/can-you-change-your-name-for-free-on-roblox_GM431946152.pdfIn PDF document text
    • https://perpus.uwhs.ac.id/repository/coin-master-mod-apk-unlimited-spin-download-free-full-version_GM406889139.pdfIn PDF document text
    • https://perpus.uwhs.ac.id/repository/how-to-get-robux-with-cheat-engine-62_GM431946152.pdfIn PDF document text
    • https://perpus.uwhs.ac.id/repository/coment-installer-un-cheat-roblox-bee-swarm-simulator-miel-infini_GM431946152.pdfIn PDF document text
    • https://perpus.uwhs.ac.id/repository/how-to-get-free-money-in-roblox-bloxburg_GM431946152.pdfIn PDF document text
    • https://perpus.uwhs.ac.id/repository/free-game-pack-with-google-play-coin-master_GM406889139.pdfIn PDF document text
    • https://perpus.uwhs.ac.id/repository/youtube-how-to-hack-free-robux-using-pastebin_GM431946152.pdfIn PDF document text
    • https://perpus.uwhs.ac.id/repository/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • https://perpus.uwhs.ac.id/repository/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://perpus.uwhs.ac.id/repository/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • https://perpus.uwhs.ac.id/repository/how-to-get-free-skins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://perpus.uwhs.ac.id/repository/free-robux-card-codes-unused_GM431946152.pdfIn PDF document text
    • https://perpus.uwhs.ac.id/repository/free-roblox-accounts-2021-april_GM431946152.pdfIn PDF document text
    • https://perpus.uwhs.ac.id/repository/minecraft-hacks-xbox_GM479516143.pdfIn PDF document text
    • https://perpus.uwhs.ac.id/repository/roblox-promo-code-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://perpus.uwhs.ac.id/repository/free-play-for-roblox_GM431946152.pdfIn PDF document text
    • https://perpus.uwhs.ac.id/repository/free-robux-no-email_GM431946152.pdfIn PDF document text
    • https://perpus.uwhs.ac.id/repository/how-to-hack-jailbreak-in-roblox-2021-infinite-money_GM431946152.pdfIn PDF document text
    • https://perpus.uwhs.ac.id/repository/minecraft-free-download-ipad_GM479516143.pdfIn PDF document text
    • https://perpus.uwhs.ac.id/repository/windows-10-minecraft-hacks_GM479516143.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_off00002ee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EE2 22644 bytes
SHA-256: 7f23ae4f4ca6d2818be3be75a7a1b3aa8d6ed9c454dc344fe9cb577b25406f99
font_01_sfnt_off000061e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61E9 18552 bytes
SHA-256: 6794fc7ee49cdd0a33f98bbbc8a763353555002210e507bd98e2a39f67d6f290

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