Malicious PDF — malware analysis report

Static analysis result for SHA-256 d347b3ef50648af8…

MALICIOUS

PDF

45.9 KB Created: 2021-05-16 15:00:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 5c3598c35f065b725e7e1e6a5a595fca SHA-1: cf639f3455334c715ba046688351a7e2000aef0d SHA-256: d347b3ef50648af816d561e2094cafc43d597fac615e5403beb8d27e6a3b44b8
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external sites, many of which are presented as 'free generators' or 'game hacks' for popular games like Robux and Coin Master. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests a malicious intent to drive traffic to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or scam attempt, likely leading to a secondary payload download or a credential harvesting page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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-for-kids-no-verification-game-hack PDF link annotation
    • http://www.isril.it/images/free-minecraft-account-and-password_GM479516143.pdfIn PDF document text
    • http://www.isril.it/images/free-400-spins-coins-master_GM406889139.pdfIn PDF document text
    • http://www.isril.it/images/games-like-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://www.isril.it/images/levvvel-coin-master_GM406889139.pdfIn PDF document text
    • http://www.isril.it/images/coin-master-hack-injection_GM406889139.pdfIn PDF document text
    • http://www.isril.it/images/village-coin_GM406889139.pdfIn PDF document text
    • http://www.isril.it/images/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • http://www.isril.it/images/how-do-you-get-roebucks-for-free_GM431946152.pdfIn PDF document text
    • http://www.isril.it/images/how-to-get-free-snacks-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.isril.it/images/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • http://www.isril.it/images/hack-version-of-coin-master_GM406889139.pdfIn PDF document text
    • http://www.isril.it/images/games-like-coin-master_GM406889139.pdfIn PDF document text
    • http://www.isril.it/images/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.isril.it/images/free-robux-place_GM431946152.pdfIn PDF document text
    • http://www.isril.it/images/how-to-play-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://www.isril.it/images/coin-master-free-spin-bonus_GM406889139.pdfIn PDF document text
    • http://www.isril.it/images/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.isril.it/images/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • http://www.isril.it/images/need-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.isril.it/images/coin-master-hack-for-android_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
stream_003_off000049b6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49B6 24664 bytes
SHA-256: 997b9987de1e1c6cf3d6d752b51080d16f70d8a811fcc041e0cd50af7f903b7e
font_01_sfnt_off00008287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8287 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off00008f2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F2F 18776 bytes
SHA-256: abcd165e4b695e85902e5e0162dd8c883b494cae8faf27dbfb1f0dc34095f980

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