Malicious PDF — malware analysis report

Static analysis result for SHA-256 67d12552e91f7d6e…

MALICIOUS

PDF

49.1 KB Created: 2021-06-07 13:35:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 8aca17f54619f6abe84821f71925b854 SHA-1: 840713f4ffc8cdbe223053c5c1ad5aec761d3886 SHA-256: 67d12552e91f7d6e548ab452786e6a592e3dfcba2e95f9a1576a1d0e2f8a5efd
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links designed to redirect users to potentially malicious websites, masquerading as game hacks and generators. The primary link leads to a known malicious redirector infrastructure. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a social engineering tactic to drive traffic to these sites, likely for further malware delivery or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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 https://netcdn.tw/app/431946152/como-hackear-los-robux-de-roblox-game-hack In PDF document text
    • http://heilzentrum-ulm.de/images/how-to-get-free-spins-on-coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/coin-master-game-legitimate-hack-without-signing-up-or-shareing_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/how-to-get-minecraft-for-free-on-computer_GM479516143.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/how-to-hack-a-minecraft-server_GM479516143.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-2021-roblox-accounts-site-v3rmillionnet_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/funny-free-roblox-t-shirt_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/how-to-get-100-robux-for-free_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-spins-coin-master-app-iphone_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/can-you-make-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-tiktok-likes-generator_GM835599320.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-robux-generator_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/tiktok-free-views_GM835599320.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/roblox-exploit-download_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/codes-to-get-free-robux_GM431946152.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_004_off00005485.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5485 26612 bytes
SHA-256: d5386f1b3910b03b799bdfd3eddf27ea9343af1bee4356b155a870831cbc8179
font_01_sfnt_off000090a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90A9 3400 bytes
SHA-256: 4b3e0f36ad1e0c7e3ea5c178fd2b4f097d1e01575fc6a4101a8b520db34dfe07
font_02_sfnt_off00009bd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9BD3 18748 bytes
SHA-256: 757b5f404f8ee3395465fcbf72eb76989c2bfdf34f28345313af81ed014381da

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