Malicious PDF — malware analysis report

Static analysis result for SHA-256 50a6c094ad4e8f84…

MALICIOUS

PDF

35.0 KB Created: 2021-06-19 03:45:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: a2a748ddefdf4f18207a5e622d64acd9 SHA-1: 8d7264f282aea52c9f06c9a2ef0dfa96df4d718c SHA-256: 50a6c094ad4e8f84534aafb6a582d2f4d47238f2f0f4c068f7bd3b89b1b4c1c5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains multiple embedded links that redirect to malicious infrastructure, masquerading as game hacks or generators. The primary lure URL is http://netcdn.co/app/431946152/hack-this-site-roblox-game-hack. This behavior is consistent with phishing or scam campaigns designed to trick users into visiting potentially harmful sites. No scripts were extracted, but the document structure and embedded URLs strongly indicate a malicious intent.

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/hack-this-site-roblox-game-hack In PDF document text
    • http://heilzentrum-ulm.de/images/how-to-get-free-robux-on-roblox-with-cheat-engine_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-roblox-back-accessories_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/outfit-roblox-free_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/how-to-get-free-money-in-roblox-rocitizens_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/cheat-roblox-lumber-tycoon-2-terbang_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-items-roblox-avatar_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/html-falso-para-roblox-para-free-robux_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/hack-pack-roblox-level-7_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/roblox-online-free-no-sign-in_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-gucci-jacket-roblox_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/survivor-hacks-script-roblox_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/hacker-web-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/roblox-gift-card-free-virtual-item_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-robux-scam-gui_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/roblox-free-rubox_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/code-for-generate-free-robux_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/can-you-make-a-minecraft-server-for-free_GM479516143.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_002_off00003089.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3089 23064 bytes
SHA-256: 99a87152eadcde5d052e287149e212ffee3da1c1b65d4f7397af44be82756d82
font_01_sfnt_off00006477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6477 18860 bytes
SHA-256: d8c76465603b4f1d20aa1919eb75437e3e47104f5141570fa14ed21299b9199e

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