Malicious PDF — malware analysis report

Static analysis result for SHA-256 44ec2002117bd375…

MALICIOUS

PDF

47.8 KB Created: 2021-06-08 10:59:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: a7723f22752399a728bf83f1ca7ccfd3 SHA-1: 4ecdeaa0b67bd9ed430373d83a7da7623717be0e SHA-256: 44ec2002117bd3755af4127f6638a3ba76d5ffd7e3644fa147f5bae49974c400
260 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to websites offering 'free generators' and 'game hacks', a common lure for social engineering. The document body and embedded links suggest a phishing attempt related to popular games like Roblox and Coin Master. The presence of numerous external PDF links indicates a link farm designed to improve SEO for these malicious lures, likely leading to further malicious content or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

Heuristics 6

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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/how-to-get-free-robux-2021-march-game-hack In PDF document text
    • http://heilzentrum-ulm.de/images/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-coins-coin-master-blog_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/roblox-com-free_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/wearedevs-roblox-speed-hack_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/how-to-get-free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/coin-master-hack-online-without-human-verification_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/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/minecraft-svg-free_GM479516143.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/hack-xp-net-generators-coin-master_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/how-to-change-roblox-username-for-free_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-robux-images_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/how-to-get-any-hat-on-roblox-for-free-2021_GM431946152.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/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-roblox-accounts-with-robux-2021-november_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-robux-cards_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_off000051c9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51C9 29604 bytes
SHA-256: c73e76f7857327fdcc5595d3665312875b709af017984ce1c756c9a212b80bab
font_01_sfnt_off000095a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95A9 19272 bytes
SHA-256: aa3dc5d1f7268cddb737ac6bc176963d92bd02a2d92c211bc31605e3ead50777

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