Malicious PDF — malware analysis report

Static analysis result for SHA-256 a76ae815c3c1d010…

MALICIOUS

PDF

32.2 KB Created: 2021-07-04 06:03:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: e08aecfa8fc2f322464b93c6d44a6145 SHA-1: b39d8431cadfbaeecc56ecf6134e5553912ef996 SHA-256: a76ae815c3c1d0101a38a1cad2b048b1cbcae51a94b622d13c487c0e9e10e67e
160 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirectors and infrastructure, disguised as 'game hacks' or 'generators'. The document body explicitly mentions 'Roblox Re' and 'Robux Generator', indicating a lure for free in-game currency. The primary malicious action observed is the redirection to the URL http://netcdn.tw/app/431946152/roblox-re-game-hack, which is flagged as malicious. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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.tw/app/431946152/roblox-re-game-hack In PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/ispoofer-pokemon-go-free_GM1094591345.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/minecraft-mojang-free_GM479516143.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/wahoo-gaming-co-free-robux_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/free-robux-just-enter-username_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/minecraft-hack-mod_GM479516143.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/coin-master-hack-apk-2021-download_GM406889139.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/coin-master-village-4_GM406889139.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/free-robux-place_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/can-u-make-clothes-for-free-on-roblox_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/free-coin-master-spins-links-2021_GM406889139.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/how-to-make-your-roblox-account-cute-for-free-girl_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/roblox-fly-hack_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/hackbox-roblox_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/roblox-hack-ios_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/free-pet-pet-zombie-attack-roblox_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/download-hacked-games-com-coin-master_GM406889139.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/free-robux-generator-no-human-verification_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
font_00_sfnt_off000029d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29D6 22044 bytes
SHA-256: 4fd10488dfa29787fe66c5dc10482895e2e2431884733cc41b1857649f2f75d2
font_01_sfnt_off00005aa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5AA4 18484 bytes
SHA-256: 9f3d5f952a5a8565a36a95a9616e220af72e779ac4925ec2f8c0411011cafdf3

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