Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b10fcc9e2074865…

MALICIOUS

PDF

41.1 KB Created: 2021-05-16 05:19:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 301d3b2f242e361a9781c4d6c5bf2f6e SHA-1: acc391b6b00aee926c46820f4bfa713b5bc60b60 SHA-256: 8b10fcc9e20748652aac63d1e47de8a0da04b43c64c0ce1fd5a386f3a1be29cb
142 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are disguised as PDF files related to game hacks and free currency. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a malicious intent to redirect users to potentially harmful sites. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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-mod-game-hack PDF link annotation
    • http://www.backlineservice.nl/images/how-to-o-get-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://www.backlineservice.nl/images/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.backlineservice.nl/images/can-i-play-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://www.backlineservice.nl/images/how-to-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://www.backlineservice.nl/images/free-robux-just-click_GM431946152.pdfIn PDF document text
    • http://www.backlineservice.nl/images/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://www.backlineservice.nl/images/free-google-play-promo-codes-coin-master_GM406889139.pdfIn PDF document text
    • http://www.backlineservice.nl/images/free-chest-coin-master_GM406889139.pdfIn PDF document text
    • http://www.backlineservice.nl/images/free-robux-rewards_GM431946152.pdfIn PDF document text
    • http://www.backlineservice.nl/images/play-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://www.backlineservice.nl/images/free-minecraft-videos_GM479516143.pdfIn PDF document text
    • http://www.backlineservice.nl/images/free-robux-no-gift-card_GM431946152.pdfIn PDF document text
    • http://www.backlineservice.nl/images/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://www.backlineservice.nl/images/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.backlineservice.nl/images/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://www.backlineservice.nl/images/download-hacked-games-coin-master_GM406889139.pdfIn PDF document text
    • http://www.backlineservice.nl/images/coin-master-hack-without-verification-ios_GM406889139.pdfIn PDF document text
    • http://www.backlineservice.nl/images/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://www.backlineservice.nl/images/coin-master-rewards-2021_GM406889139.pdfIn PDF document text
    • http://www.backlineservice.nl/images/how-to-get-free-robux-easy_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_002_off0000452b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x452B 25256 bytes
SHA-256: 9583e685b7b805fad252ea1bd6568ca40c3bfaae58d38040e12a10c45c2627ed
font_01_sfnt_off00007e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E71 18384 bytes
SHA-256: 1a22b4d0ddd13aadfbc34487f46de63ded67addff296de1d1ab8eef84ffc4180

Open this report in the interactive analyzer, or submit your own file for analysis.