Malicious PDF — malware analysis report

Static analysis result for SHA-256 3940647ab4ed1c37…

MALICIOUS

PDF

47.8 KB Created: 2021-05-10 21:09:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 9568ecac663b8bea621106af06335f56 SHA-1: 3165a2eb70384f477491a2b9129913a08e5e61a0 SHA-256: 3940647ab4ed1c37e55349b49c1c30927df8e7cd4083def74362e302fb147317
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains multiple links to known malicious redirectors, disguised with lures related to free game currency. The presence of a fake CAPTCHA suggests an attempt to trick the user into interacting with the document, likely to initiate a download or exploit. The document's structure and embedded URLs indicate a phishing or social engineering attack aimed at users seeking in-game advantages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.xyz/app/431946152/is-there-a-way-to-get-free-robux-game-hack In PDF document text
    • http://fia.ub.ac.id/katalog/repository/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/roblox-devil_GM431946152.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/app-master_GM406889139.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/instantrobux_GM431946152.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/blogspot-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/free-minecraft-mods-for-ps4_GM479516143.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/watch-videos-for-robux_GM431946152.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/how-to-get-free-shields-on-coin-master_GM406889139.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/free-robux-glitch-2021_GM431946152.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/coin-master-hack-with-facebook-login_GM406889139.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/www-coinmaster_GM406889139.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/coin-master-free-spins-link-2021-hack_GM406889139.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/coin-master-hack-app-android-download_GM406889139.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/coin-master-free-spins-whatsapp-link_GM406889139.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/coin-master-real-free-spins_GM406889139.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/how-to-play-minecraft-with-friends-for-free_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b34.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B34 26064 bytes
SHA-256: 442171d0e6b78eef1680f7bccbb2466f6d276c198c82ccc5aa35ec018b09e427
font_01_sfnt_off00008654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8654 4660 bytes
SHA-256: b8980cdac4d025496d9fe039d8c05bb5b9bae1b804244a1f9c05e9663db72816
font_02_sfnt_off00009665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9665 18892 bytes
SHA-256: e2ca2daecae93cd27ff1d51a172310d30bada5b25af9f9600d3ad780ee102f76

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