Malicious PDF — malware analysis report

Static analysis result for SHA-256 85c649cae4bb71da…

MALICIOUS

PDF

34.6 KB Created: 2021-07-04 09:13:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: d979b8ce4b908b7696b05629a639643e SHA-1: 943bf82b5457ca5a22151e8b9bc36697ca5c4069 SHA-256: 85c649cae4bb71da550de4e233e30d5e49d95c0f2e4d85c48cd91c3c7236c25b
240 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains links to known malicious redirectors, specifically advertising free game hacks and generators. The document body and heuristics indicate a lure to download potentially malicious content, possibly requiring a password as suggested by the 'SE_PASSWORD_ARCHIVE_LURE' finding. The presence of embedded URLs and the ML classifier's high confidence score support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/free-roblox-script-executor-game-hack In PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-gen-website_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/robux-earner_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-get-roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-printable-roblox-images_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-galaxy-hack_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-50-tiktok-views_GM835599320.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/minecraft-hacks-pc_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/minecraft-pocket-edition-apk-free-download_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/minecraft-free-unblocked_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-cards-hack-2021_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-coin-master-hacks-no-verification-or-survey_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/hack-roblox-with-cmd_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-draw-youtube-roblox_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/rbx-website_GM431946152.pdfIn macro / runtime command snippet
    • http://www.library.umbjm.ac.id/repository/free-roblox-usernames-and-passwords_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-com-www_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/robux-in_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/robux-claimer_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repositorIn macro / runtime command snippet
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00002e6a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2E6A 23060 bytes
SHA-256: 2b5a1dfeb16844be58f22c9a27103bb8dcec8483624ce23dab4eb2317a14f276
font_01_sfnt_off000061dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61DD 19192 bytes
SHA-256: 0ba7e7d5fd8df798e70dfad4e7f149b03f2bd1e3103381c6ab8af076a8db2d07

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