Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a9b071eb9296006…

MALICIOUS

PDF

44.3 KB Created: 2021-06-03 20:13:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 48dae00dd063476cc90af6dd6037d578 SHA-1: d8e0990a58c3e9171116c3b48944621bdb9e0037 SHA-256: 6a9b071eb9296006e65717ac1f5d0d95e9415aecc8fd1fdfd9a9a6f9abb943e8
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 0.9865

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/406889139/coin-master-free-spins-link-ios-game-hack PDF link annotation
    • http://www.rewaqousha.net/userfiles/files/free-robux-sites-that-work_GM431946152.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/free-spins-coin-master-generator_GM406889139.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/moonactive-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/free-minecraft-bedrock-server-hosting-24-7_GM479516143.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/coin-master-hack-using-lucky-patcher_GM406889139.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/how-to-use-scripts-in-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/hacks-for-roblox-prison-life_GM431946152.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/how-to-hack-peoples-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/wurst-client-18-9_GM479516143.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/can-you-really-hack-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/coin-master-hack-spins-android_GM406889139.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/how-do-u-get-robux_GM431946152.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/real-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/pokemon-go-free-joystick-ios_GM1094591345.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/minecraft-bedrock-edition-pc-download-free_GM479516143.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/free-spin-coin_GM406889139.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/coin-master-hack-2021_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
stream_004_off00004f46.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F46 27424 bytes
SHA-256: c488039d356ab328d65e50a49ba7868ff3fdbb95f9b94061b9c9591a55da5a9c
font_01_sfnt_off00008b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B72 18056 bytes
SHA-256: a4f33549350803e8a819cbfad6b4ff3cdc0b302ceab74af9f2f663eab6bd9ec0

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