Malicious PDF — malware analysis report

Static analysis result for SHA-256 b945ec5c4762a468…

MALICIOUS

PDF

50.8 KB Created: 2021-06-03 08:47:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 86615382744b7f2ef4246345bc50dd53 SHA-1: 90fb598ed3e221677b0b99ad30b2b70b88bb94ac SHA-256: b945ec5c4762a468b81ea5b206741a8b4e475fd8c97d8782583a9d4085200af4
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and a link farm, aiming to trick users into downloading potentially malicious files. The document body, though heavily obfuscated, contains references to 'Robux Generator' and 'game hack', aligning with the heuristic findings of a lure for free generators or game hacks. The presence of numerous external PDF links suggests a tactic to distribute further malicious content or SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9744

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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 https://netcdn.online/app/431946152/robux-generator-no-human-verification-2021-game-hack In PDF document text
    • http://librarysenior.com//repository/download-coin-master-apk-hack_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/tiktok-free-recharge-500_GM835599320.pdfIn PDF document text
    • http://librarysenior.com/repository/coin-master-free-coins-twitter_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/coin-master-daily-free-spins-link-download_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/free-roebucks-no-human-verification_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-master-cards-hack_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/minecraft-servers-that-allow-hacks_GM479516143.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-master-hack-apk-iphone_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-master-apk-hack-2021_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-master-claim-spins_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/free-spins-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/apps-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-master-mod-version-free-download-34-4_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/how-to-get-free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/free-robux-master_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/coin-master-free-spins-heaven_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/20210-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005223.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5223 30972 bytes
SHA-256: bd9299893805e0ed6a6ece92c0d60987834c18d277e747bf4f4c4743727f1842
font_01_sfnt_off000097c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97C8 2820 bytes
SHA-256: 34dd21cbcbbf8680f9624d5ddfa25e49232e6768200f74ddacb5347fd7a5f6dc
font_02_sfnt_off0000a169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA169 19100 bytes
SHA-256: 46a9854d527783ca7b1ede509fad300d1746770329f3da0d8c08611a91ea25c5

Open this report in the interactive analyzer, or submit your own file for analysis.