Malicious PDF — malware analysis report

Static analysis result for SHA-256 45cf40d3f3e87eb3…

MALICIOUS

PDF

34.3 KB Created: 2021-07-06 04:58:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 7e1bb19929fa0bb504513365b5550385 SHA-1: ba6f3d2f54f1f2f8941a5f89b0a81f82097dfa0c SHA-256: 45cf40d3f3e87eb3eb6eafc45f17545c17d4c396c0c0fe479adef19c46a21659
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 0.9980

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 http://netcdn.tw/app/406889139/coin-master-blogspot-game-hack PDF link annotation
    • http://library.forda-mof.org/katalog/repository/clean-master-hack-coins_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/games-that-can-be-hacked_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/minecraft-hacked-client-112-2_GM479516143.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/apps-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/free-plain-yellow-t-shirt-roblox_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/free-robux-apk_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/coin-master-hack-software-download_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/websites-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/get-free-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/get-free-robux-now_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/freerubux_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/pubg-uc-unlimited-free_GM1330123889.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/coin-master-free-spin-and-coins-links-home_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/free-pet-roblox-pet-simulator_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/coin-master-free-spinv1-0apkpure-com-apk_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/www-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/coin-master-hack-free-spins_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_off000030b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30B5 22756 bytes
SHA-256: d8bbe733ce70d4e0c3f258fd1d19c909725f9efc565f723a87c5f1950f9811a6
font_01_sfnt_off00006371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6371 18300 bytes
SHA-256: 0a317ed1e516c2c88218383b0b7f7e36ebc6c0d231e83ae0ac0c6c70ae5b4b7d

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