Malicious PDF — malware analysis report

Static analysis result for SHA-256 349e777ba1ba3f6f…

MALICIOUS

PDF

36.0 KB Created: 2021-06-19 05:19:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 484abfa79641ec02e371d119f86f6394 SHA-1: 6ee29af51f01f7ee8abd328fe8fb33054c39aa77 SHA-256: 349e777ba1ba3f6fb6d688fc21db088866573d237cc64c98eb82fdc66e4ca962
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and websites offering 'free generators' or 'hacks' for popular games, which is a common lure for phishing or malware distribution. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the embedded URLs and the nature of the lures suggest an attempt to redirect the user to a malicious site, likely to download a payload or phish for credentials.

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/free-robux-no-human-verification-no-survey-game-hack In PDF document text
    • http://unifieo.br/images/roblox-assassin-hacks-2021_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/roblox-girl_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/coin-master-free-coins-and-spins-hack_GM406889139.pdfIn PDF document text
    • http://unifieo.br/images/free-backpack-in-roblox_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/minecraft-name-tag-hacks_GM479516143.pdfIn PDF document text
    • http://unifieo.br/images/free-roblox-followers_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/minecraft-build-hacks_GM479516143.pdfIn PDF document text
    • http://unifieo.br/images/how-to-get-free-coins-in-roblox-pet-simulator_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/coin-master-free-coins-hack_GM406889139.pdfIn PDF document text
    • http://unifieo.br/images/how-to-get-more-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://unifieo.br/images/coin-master-free-spins-app-for-iphone_GM406889139.pdfIn PDF document text
    • http://unifieo.br/images/how-to-create-group-in-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://unifieo.br/images/roblox-vehicle-simulator-money-hack-download_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/schoto-roblox-free-shop-hair_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/how-to-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://unifieo.br/images/earn-free-robux_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/free-minecraft-server-maker_GM479516143.pdfIn PDF document text
    • http://unifieo.br/images/free-coin-master-spins-daily_GM406889139.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
font_00_sfnt_off000031e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31E7 23372 bytes
SHA-256: d8aac01f4c1dbb92001bd58a0f30442bd188089967e3041ef97560c504eeaf87
font_01_sfnt_off000066c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66C3 19440 bytes
SHA-256: cf56293e8c57be014de73bb21d64abf71a96a9e4af86eaaff6e5087cff794c74

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