Malicious PDF — malware analysis report

Static analysis result for SHA-256 c38907b7439bbe54…

MALICIOUS

PDF

34.4 KB Created: 2021-06-19 17:50:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 9bccee6ceba22745c23658460f9c2108 SHA-1: a393a1db653c588557594aab3d75d2fc1672ef34 SHA-256: c38907b7439bbe5447101afaebf7a2f81e140c475c9584903402b011be8a70c0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically advertising free game generators and hacks. The heuristic firings indicate that these links are part of a known malicious redirector chain. The document body also contains a prominent call-to-action to access a 'Robux Generator', reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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/free-roblox-games-no-sign-up-game-hack In PDF document text
    • http://krumerhaus.at/images/roblox-arsenal-hacks-download_GM431946152.pdfIn PDF document text
    • http://krumerhaus.at/images/cheats-for-roblox-rocitizens_GM431946152.pdfIn PDF document text
    • http://krumerhaus.at/images/coin-master-free-spins-daily_GM406889139.pdfIn PDF document text
    • http://krumerhaus.at/images/coin-master-daily-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://krumerhaus.at/images/pokemon-go-free-items-code_GM1094591345.pdfIn PDF document text
    • http://krumerhaus.at/images/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://krumerhaus.at/images/fighting-free-card-coin-master_GM406889139.pdfIn PDF document text
    • http://krumerhaus.at/images/tiktok-free-overlays_GM835599320.pdfIn PDF document text
    • http://krumerhaus.at/images/free-coins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://krumerhaus.at/images/free-college-textbooks-tiktok_GM835599320.pdfIn PDF document text
    • http://krumerhaus.at/images/robux-games_GM431946152.pdfIn PDF document text
    • http://krumerhaus.at/images/pokemon-go-no-free-box_GM1094591345.pdfIn PDF document text
    • http://krumerhaus.at/images/how-to-get-hacks-on-roblox_GM431946152.pdfIn PDF document text
    • http://krumerhaus.at/images/how-to-hack-in-roblox-mobile_GM431946152.pdfIn PDF document text
    • http://krumerhaus.at/images/free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://krumerhaus.at/images/how-to-get-free-things-on-roblox_GM431946152.pdfIn PDF document text
    • http://krumerhaus.at/images/getrobux-info_GM431946152.pdfIn PDF document text
    • http://krumerhaus.at/images/redeem-code-hack-roblox_GM431946152.pdfIn PDF document text
    • http://krumerhaus.at/images/minecraft-classic-free_GM479516143.pdfIn PDF document text
    • http://krumerhaus.at/images/coin-master-free-spins-for-today_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
font_00_sfnt_off00002ec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EC5 22500 bytes
SHA-256: ac03ee1bea018f92d795aa78d22b43d1bc2a1c1f31ed4abf3f790e3b2842520e
font_01_sfnt_off00006109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6109 19204 bytes
SHA-256: b92e8dc3b26f8e6927eef09b6c76096999a4845af4a4e82a8660c345103c581d

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