Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3955617d57289c8…

MALICIOUS

PDF

46.5 KB Created: 2021-05-12 17:02:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 2aa19a36ececefac88021bffe5a1222f SHA-1: 0a663b641d9af428cd1071cb668fefe235950ba0 SHA-256: c3955617d57289c86d219537c91d43708c5d9b7adaa915b11536d95abc3a2edb
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are presented as game hacks or generators for popular games like Roblox and Coin Master. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a link farm or redirection scheme. The ML classifier also flagged the PDF as malicious, supporting this assessment. No scripts were extracted, but the primary attack pattern involves social engineering through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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.xyz/app/431946152/free-robux-2021-game-hack PDF link annotation
    • http://pustaka.bbppketindan.info/repository/worst-roblox-avatars_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/free-attacks-on-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-hack-tool-access-online-generator_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-free-spins-and-coins-link-haktuts_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/hackear-coin-master-sin-root_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/spins-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/bux-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-hack-ios-apk_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/free-spin-sites-for-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/free-game-pack-with-google-play-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/how-do-you-get-free-roebucks_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-game-hack-app-download_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/minecraft-tower-defense-hacked_GM479516143.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/orewards-com-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/free-coins-coin-master-today_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-free-spins-hack-link_GM406889139.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
font_00_sfnt_off00004832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4832 28672 bytes
SHA-256: 48179399ddd63eb5373a81cae089823ef238689c8088a194be6e85835a81fa13
font_01_sfnt_off000088f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88F2 2872 bytes
SHA-256: 5a38050e56bfed6ba013c4835499ae05f4b57b22e606c9172dd4bc2ae7fd1207
font_02_sfnt_off000092ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92AD 18416 bytes
SHA-256: a2c808792aaeb1607b9c3a91ae122c662faffffe8d42f3cf4118be6ccc5b3e7b

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