Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a81ca72fa7552bc…

MALICIOUS

PDF

34.0 KB Created: 2021-07-04 13:24:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: ac1367fed5adfe25c88f608fa1c16bae SHA-1: 8eca7fe263c1f3c2d2c5c434ac8a706bdce8d19c SHA-256: 2a81ca72fa7552bcd43f3b767529df88c8a5e1a4d1519d51d8c15df24f0e8f37
240 Risk Score

Malware Insights

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

The PDF document contains multiple lures for free in-game currency and hacks, directing users to malicious redirectors. The heuristics indicate a critical finding of a malicious redirector link and a lure for clipboard command execution, suggesting the document is designed to trick users into running malicious commands or visiting dangerous sites. No scripts were extracted, but the overall pattern points to a phishing or scam attempt.

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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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-roebucks-no-human-verification-game-hack In PDF document text
    • http://librarysenior.com/repository/freespinandcoin-blogspot-com_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/cool-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://librarysenior.com/repository/how-to-generate-free-coin-master-spin_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/free-account-and-password-roblox-generator_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-master-hack-apk-2021_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/25-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/how-to-get-free-robux-app_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/roblox-free-play_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/free-robux-wheel_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/free-robux-websites-2021_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/minecraft-items_GM479516143.pdfIn PDF document text
    • http://librarysenior.com/repository/free-codes-for-roblox-mineing-sim_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/how-to-get-robot-animation-for-free-roblox_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/www-robux-com_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/coin-master-gold-cards-hack_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/free-spins-coin-master-site-wwwquoracom_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/coin-master-free-spins-2021-no-human-verification_GM406889139.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_off00002fd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FD5 21616 bytes
SHA-256: c2dd8750e685197704cdb976089ac4b2523ad99b77a4fc098c68f4e0306781ab
font_01_sfnt_off00005f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F4B 19296 bytes
SHA-256: cc9c5a95e89479f65faae98250eeca370e5ba8f51e12989c5a527e80fde28b16

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