Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aaad7a082c19e73…

MALICIOUS

PDF

42.3 KB Created: 2021-05-15 17:26:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: edc66c909d2e3191e8ecfc00aa250e26 SHA-1: ef1c17e4199ec435a469c5058c8be0e09c59f51b SHA-256: 6aaad7a082c19e7365589e532c8480ebd56360e8c7940dd051415476573f9d78
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 0.9971

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/406889139/free-spins-for-coin-master-on-1-19-19-game-hack PDF link annotation
    • http://bildhauerei-roerig.de/images/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://bildhauerei-roerig.de/images/coin-master-ios-hack-download_GM406889139.pdfIn PDF document text
    • http://bildhauerei-roerig.de/images/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • http://bildhauerei-roerig.de/images/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://bildhauerei-roerig.de/images/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • http://bildhauerei-roerig.de/images/can-you-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://bildhauerei-roerig.de/images/free-robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • http://bildhauerei-roerig.de/images/coin-master-free-cards-link-2021-today_GM406889139.pdfIn PDF document text
    • http://bildhauerei-roerig.de/images/minecraft-apk-free-download_GM479516143.pdfIn PDF document text
    • http://bildhauerei-roerig.de/images/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • http://bildhauerei-roerig.de/images/ios-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://bildhauerei-roerig.de/images/what-do-points-do-in-roblox_GM431946152.pdfIn PDF document text
    • http://bildhauerei-roerig.de/images/get-free-spins-link-in-coin-master_GM406889139.pdfIn PDF document text
    • http://bildhauerei-roerig.de/images/free-coin-master-stuff_GM406889139.pdfIn PDF document text
    • http://bildhauerei-roerig.de/images/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • http://bildhauerei-roerig.de/images/coin-master-lucky-patcher-hack_GM406889139.pdfIn PDF document text
    • http://bildhauerei-roerig.de/images/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://bildhauerei-roerig.de/images/free-op-minecraft-servers_GM479516143.pdfIn PDF document text
    • http://bildhauerei-roerig.de/images/ways-to-get-robux_GM431946152.pdfIn PDF document text
    • http://bildhauerei-roerig.de/images/robloxheroxyz-free-robux_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_003_off00004b1f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B1F 24432 bytes
SHA-256: bfe1545c530d877ab2b1e63b1abec3df777a5d15fe2c26460fb953a8eff5f78b
font_01_sfnt_off00008361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8361 18156 bytes
SHA-256: b0a36ecb2e3994d8896217b2a143a3ffdf588c2d696638deb18a4d2fea054774

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