Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cbb759452d4c2d9…

MALICIOUS

PDF

33.0 KB Created: 2021-07-09 21:57:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f8f1dad7c127635c5884dcf6edfe2453 SHA-1: dfd075e6a72e44514cd847a1d84b31ad6746f40f SHA-256: 7cbb759452d4c2d9b8eb2dd7e5b3b3cec0b9bd8e3dda4e55748f9ae1b30db824
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and other PDFs, masquerading as game hacks or generators. The primary lure appears to be related to Minecraft and Roblox, aiming to trick users into visiting these malicious sites. The ML classifier strongly indicates 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/479516143/free-minecraft-hosting-24-7-game-hack In PDF document text
    • http://mbbs.hr/files/roblox-play-now-for-free_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/roblox-ftw_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/free-robux-no-human-verifaction-and-survey_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/blox-land-free-robux_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/unlimited-robux_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/no-human-verification-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/how-to-look-like-a-hacker-in-roblox_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-hack-apk-download-for-android_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/robux-win_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/roblox-acessories-script-hack_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/speed-hack-assasin-roblox_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/doctor-louie-roblox_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-hack-apk-download-2021_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/free-robux-2021_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/free-robux-card-codes_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_off00002d33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D33 22168 bytes
SHA-256: 822a7d22357427c5cbf2db1b8afbe70bb1f112803deb6231fb375b9e3366d436
font_01_sfnt_off00005e66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E66 18240 bytes
SHA-256: a1d0dda2a20c23c2f6b5d38f821eb00881ee16adc5cb924d70fa236c90a36e37

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