Malicious PDF — malware analysis report

Static analysis result for SHA-256 07aad514acfb9baa…

MALICIOUS

PDF

34.1 KB Created: 2021-06-18 13:54:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7abf366466499f1f08707b3bc89cb863 SHA-1: f9d8accb2206879e2d42ed8daaaec0f1398abc2a SHA-256: 07aad514acfb9baa87fd261fca95e96e11f8a11b4217fe21de1f459039e65f74
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF document contains a large number of external links, many of which are SEO-optimized and point to pages promising free in-game items or hacks for popular games. The ML classifier strongly flagged this PDF as malicious, and the presence of a "download button" heuristic suggests a lure to trick users into clicking these links. The primary attack pattern is likely a phishing or scam attempt designed to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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
  • 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 http://netcdn.co/app/431946152/how-to-get-free-hair-on-roblox-2021-game-hack In PDF document text
    • http://berntfoto.dk/images/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • http://berntfoto.dk/images/roblox-dbor-how-to-hack-levels_GM431946152.pdfIn PDF document text
    • http://berntfoto.dk/images/how-to-get-minecraft-dungeons-for-free_GM479516143.pdfIn PDF document text
    • http://berntfoto.dk/images/master-free-spin_GM406889139.pdfIn PDF document text
    • http://berntfoto.dk/images/comment-cheater-sur-roblox-franais-sur-jailbreak_GM431946152.pdfIn PDF document text
    • http://berntfoto.dk/images/how-to-hack-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://berntfoto.dk/images/how-to-download-minecraft-for-free-on-your-phone_GM479516143.pdfIn PDF document text
    • http://berntfoto.dk/images/i-was-hacked-by-liepa20212021910-on-roblox_GM431946152.pdfIn PDF document text
    • http://berntfoto.dk/images/coin-master-heaven-links_GM406889139.pdfIn PDF document text
    • http://berntfoto.dk/images/how-to-earn-robux_GM431946152.pdfIn PDF document text
    • http://berntfoto.dk/images/how-do-you-get-robux-on-roblox-for-free-2021_GM431946152.pdfIn PDF document text
    • http://berntfoto.dk/images/how-to-play-minecraft-for-free-on-computer_GM479516143.pdfIn PDF document text
    • http://berntfoto.dk/images/coin-master-34-4-free-download_GM406889139.pdfIn PDF document text
    • http://berntfoto.dk/images/coin-master-hacksco_GM406889139.pdfIn PDF document text
    • http://berntfoto.dk/images/coin-master-spin-link-hack_GM406889139.pdfIn PDF document text
    • http://berntfoto.dk/images/how-to-get-free-robux-no-scams-no-hacks_GM431946152.pdfIn PDF document text
    • http://berntfoto.dk/images/roblox-how-to-get-free-clothes_GM431946152.pdfIn PDF document text
    • http://berntfoto.dk/images/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://berntfoto.dk/images/how-to-get-free-coins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://berntfoto.dk/images/free-robux-generator-no-verification_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
font_00_sfnt_off00002d25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D25 22516 bytes
SHA-256: 1491eff5497a6fcbff778bcccc887eaaf1913f8c04fbc63453c0bd1e4553dff4
font_01_sfnt_off00005f53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F53 19252 bytes
SHA-256: f8cdcda43cf4fd07d36a5b8c51a8a326f2e9c4c039fc2775bf69fa3107f8e48e

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