Malicious PDF — malware analysis report

Static analysis result for SHA-256 de4b575de4504f75…

MALICIOUS

PDF

34.4 KB Created: 2021-07-05 20:15:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: cd56c8f0b43944e21b402c64f435627f SHA-1: 9877110c5fc7c7c790d05778a97efbfe0f4546f6 SHA-256: de4b575de4504f7584565a0b62baa73317b740e57ee499a9799449a7d876b49d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of free game hacks and currency to entice users. It contains multiple embedded URLs that redirect to malicious infrastructure, including other PDFs, likely to facilitate further exploitation or phishing. The ML classifier strongly indicated maliciousness, and the presence of redirector links confirms a malicious workflow.

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.tw/app/431946152/roblox-com-free-play-game-hack In PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/no-verification-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/minecraft-pe-apk-free-download_GM479516143.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/where-can-i-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/http-blackgamesus-coinmasterhack_GM406889139.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/free-robux-microsoft_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/coin-master-claim-spins_GM406889139.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/can-you-get-legitimate-free-robux_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/obby-100m-free-robux_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/minecraft-hacks-for-2b2t_GM479516143.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/roblox-gift-card-hack-2021_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/roblox-full-game-free-download_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/roblox-phantom-forces-hack_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/coin-master-free-soins_GM406889139.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/roblox-dinosaur-simulator-free_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/free-coins_GM406889139.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/coin-master-gold-cards-free_GM406889139.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/minecraft-java-free-download_GM479516143.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/free-tdm-shirt-roblox_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/coin-master-free-spins-app-android_GM406889139.pdfIn PDF document text
    • https://www.roblox.com/.IIn 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_off00003208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3208 21432 bytes
SHA-256: fd7df59c8e8f5b56b893f05cef959713dda6582da10e2db82ce46d4e1cc73238
font_01_sfnt_off000060c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60C4 19244 bytes
SHA-256: 757b6080daffd378f956ea9d87277f97d9d8e28a161ab3cdc6c6420d2ff89f96

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