Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1521f393c3988ac…

MALICIOUS

PDF

33.8 KB Created: 2021-07-04 08:00:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 5d1b37fe0f3df7387e094bf99453ebab SHA-1: f3bed2ce6fe731f27bed242a749d1ad4045620e1 SHA-256: b1521f393c3988ac5db5bee2f86089e0fd244ec0b63829bffb75394ba055de00
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a critical heuristic firing for a game hack lure, redirecting to known malicious infrastructure. The embedded URL and document body content both point to a scam designed to trick users into visiting a malicious site. No scripts were extracted, but the primary attack vector is the malicious link.

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.tw/app/406889139/coin-master-free-cards-hack-game-hack In PDF document text
    • https://www.wco.org.uk/uploads/files/files/terminal-railways-have-a-train-free-roblox-new-update_GM431946152.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/roblox-robux-hack-2021-android_GM431946152.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/play-minecraft-pocket-edition-for-free_GM479516143.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/roblox-giveaway-top-hack_GM431946152.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/play-this-game-for-free-robux_GM431946152.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/roblox-hacked-com-2021_GM431946152.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/roblox-restaurant-tycoon-money-cheat-2021_GM431946152.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/free-roblox-wings-2021_GM431946152.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/coin-master-hacks-that-actually-work_GM406889139.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/free-games-to-play-roblox_GM431946152.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/hack-de-roblox-dinero-infinito-en-rocitizens_GM431946152.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/coin-master-free-spins-uk_GM406889139.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/coin-master-free-cards-2021_GM406889139.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/jailbreak-roblox-hack-dll_GM431946152.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/coin-master-spin-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/online-coin-master-free-spin-app_GM406889139.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/free-robux-gen_GM431946152.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/mobihack-net-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/free-robux-command-2021_GM431946152.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/minecraft-svg-images-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_off000030c8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30C8 21952 bytes
SHA-256: 896ea9c92ce5373ee2468ccf60a8bb3ef01131dcd69fe5fb3400f4e1c0cc719a
font_01_sfnt_off00006134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6134 18340 bytes
SHA-256: 46bbcb93cdf3c0d295b315ab7e658e4bf46b20485efcdd5d2b69d88a805ee664

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