Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c888de1cd19b44e…

MALICIOUS

PDF

46.5 KB Created: 2021-06-03 23:36:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: bfb5bd5408fcc8f85cf1023d58ea2612 SHA-1: dbf0bf37ce2e5005e58977b6c397a11b41b3f8f8 SHA-256: 5c888de1cd19b44eee32bd6def519ed29677ef0f00537eaf7cd63bfe2c397f73
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/free-roblox-money-game-hack PDF link annotation
    • http://library.umuslim.ac.id//repository/coin-master-free-spins-links-app_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id//repository/coin-master-free-spins-and-coins-app_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/free-spins-on-coin-master-2021-ios_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/free-minecraft-accounts-reddit_GM479516143.pdfIn PDF document text
    • http://library.umuslim.ac.id//repository/coin-master-online-hack-generator_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/coin-master-tiradas-gratis-link_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/coin-master-golden-cards-hack_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id//repository/coin-master-free-spins-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id//repository/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/win-free-robux_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id//repository/offers-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id//repository/hack-version-of-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/free-minecraft-capes_GM479516143.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/hack-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/huskybuscom-free-robux_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/free-minecraft-premium-account_GM479516143.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/can-you-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id//repository/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id//repository/roblox-hack-ios_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
stream_004_off000056ad.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x56AD 27024 bytes
SHA-256: 1be3daddf53175e51b0e79fb3ecbbd0f5238ef80e60155bd31aa81263907f577
font_01_sfnt_off00009309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9309 18324 bytes
SHA-256: 592c86f68d7cfce1f91e7ace661462f05e7807c87c96d21e42ea748452481f78

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