Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f2d2d7bb5ad5680…

MALICIOUS

PDF

47.7 KB Created: 2021-05-13 14:21:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: fa4c66b83babdcef24ca2a45bc0b140b SHA-1: d5bad40f14662fd54b017be1f385996d5562afb8 SHA-256: 3f2d2d7bb5ad5680ddc6de42d4aea668cc3190585038a0d0da05b1ee23f4febb
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 0.9013

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/roblox-piano-hack-game-hack PDF link annotation
    • http://kontaktadig.se/images/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/coin-master-official-fan-page_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/robloxfun-com-generator_GM431946152.pdfIn PDF document text
    • http://kontaktadig.se/images/how-to-free-robux_GM431946152.pdfIn PDF document text
    • http://kontaktadig.se/images/minecraft-bedrock-free-with-java_GM479516143.pdfIn PDF document text
    • http://kontaktadig.se/images/coin-master-game-free-play-online_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/archery-master-3d-unlimited-coins-hack_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/mcpe-master-unlimited-coins-hack-apk_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/hack-coin-master-1_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/coin-master-free-100-spin_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/coin-master-hack-apk-35-8_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/how-to-get-free-robux-without-downloading-apps-2021_GM431946152.pdfIn PDF document text
    • http://kontaktadig.se/images/free-roblox-wings_GM431946152.pdfIn PDF document text
    • http://kontaktadig.se/images/coin-master-spin-link-free_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/coin-master-hack-apk-2021-ios_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/free-daily-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/you-promised-my-son-free-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_003_off00004d10.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D10 27036 bytes
SHA-256: 42cc21672325cace2b48d2e086a34bcd6759d7fc87a3dfa6624eeb1f64000b82
font_01_sfnt_off00008bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BB9 3552 bytes
SHA-256: c075fcebe1b7d9e678d136a6b46e520eb0cb246e3cf76643d910bf251e4dae29
font_02_sfnt_off00009788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9788 18456 bytes
SHA-256: b3a5bdafa913fbeb08409da0979c792cb3491f79dd739ad0ffcb7a8a40d00987

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