Malicious PDF — malware analysis report

Static analysis result for SHA-256 8373405dc68822fd…

MALICIOUS

PDF

46.7 KB Created: 2021-06-10 12:44:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 252185cd4dceafb5280051e95804d77b SHA-1: cf004b092c3980640a4aae64fae59e778d5e9642 SHA-256: 8373405dc68822fdd01083e22a6e2bdc2eedcded1b104482e8897cec55ae68fa
160 Risk Score

Malware Insights

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

The PDF document contains multiple links, including one to a known malicious redirector infrastructure, disguised as a 'free generator / game hack'. The document body and embedded links suggest a lure to trick users into visiting potentially malicious websites. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious redirector workflow, likely leading to further exploitation or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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 https://netcdn.tw/app/431946152/free-roblox-high-school-2-promo-codes-game-hack In PDF document text
    • http://heilzentrum-ulm.de/images/free-minecraft-skins-xbox-one_GM479516143.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-minecraft-maps_GM479516143.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/roblox-money-cheat-codes_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/coin-master-hack-app-android-download_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/roblox-jailbreak-free-money_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/adopt-me-roblox-money-hacks_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/pubg-uc-rate-in-india_GM1330123889.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/robux-hack-generator-email_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/robux-free-tips-apk_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-roblox-script-executor-2021_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/get-free-robux_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/hacker-man-roblox-script_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/point-prizes-free-robux_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-roblox-gift-cards-live_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/all-of-the-free-roblox-clothes_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-2021-roblox-accounts-site-v3rmillionnet_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_004_off0000524a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x524A 27040 bytes
SHA-256: 13d616e91a71e9da3411ef0540d3b6e63d9cac03a5d4f1dadea6e9e79b7a5b48
font_01_sfnt_off0000917c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x917C 19236 bytes
SHA-256: c7e5c7962876ba64dfd4ddd0e4ebc98167a6dee51f7fc0c25faa460acee98880

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