Malicious PDF — malware analysis report

Static analysis result for SHA-256 3401d6adc3edaacf…

MALICIOUS

PDF

46.6 KB Created: 2021-06-11 05:42:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 574690e79336b9b9a7a8fef9eca121e2 SHA-1: d47a33dbefabcc4fbabaa523013e58c8eba6a285 SHA-256: 3401d6adc3edaacf4292b9df7aa269b83dd5124868e7f55529c40484a5875cd5
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links designed to lure users with promises of free items and game hacks, directing them to a known malicious redirector. The document body and heuristics indicate a phishing or scam attempt, likely to lead to a malicious website or download. No scripts were extracted, but the structure and embedded URLs strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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/free-items-roblox-avatar-game-hack In PDF document text
    • http://heilzentrum-ulm.de/images/get-coin-master-free-spin_GM406889139.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/how-to-get-free-shoulder-pets-on-roblox_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/minecraft-classic-free_GM479516143.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/roblox-jailbreak-free-money_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/roblox-bee-swarm-simulator-script-gui-free-bees_GM431946152.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/hacking-classes-for-roblox_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/roblox-admin-lua-script-hack_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-robux-for-free-no-human-verification_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-coin-and-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-robux-scam-gui_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/how-too-hack-a-roblox-account_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/robux-gift-card-free_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_002_off00004ea4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EA4 28408 bytes
SHA-256: c69922830fd332e8a1e648390c47e69fda7ce03197f50d22e8edc0e676977301
font_01_sfnt_off00009381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9381 18652 bytes
SHA-256: c48aa6baee56a28d5a78a49f3358f02e66ee893e78c1a9f2301a6851df934072

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