Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d85b15d4d09cb1e…

MALICIOUS

PDF

48.7 KB Created: 2021-06-10 18:35:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 0e85e1386a98a9158493e70c8d22f606 SHA-1: d101d52f6d442efcf565f01d60648e725cc3dec8 SHA-256: 7d85b15d4d09cb1eaaa53d8f61875256267becd60d25eb123760b7438d9de14b
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains multiple links to malicious redirectors, disguised as game hacks and cheats for popular games like Roblox and Coin Master. It impersonates brands such as Amazon to increase user trust, employing a call-to-action to encourage downloads. The primary IOC is the malicious redirector URL, which likely serves as a gateway to further malicious content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.tw/app/431946152/aimbot-download-free-roblox-game-hack.
  • 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/aimbot-download-free-roblox-game-hack In PDF document text
    • http://huananhai.net/images/get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/coin-master-hack-android-root_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://huananhai.net/images/armadyne-industries-free-roblox_GM431946152.pdfIn PDF document text
    • http://huananhai.net/images/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/www-rbxhut-com_GM431946152.pdfIn PDF document text
    • http://huananhai.net/images/minecraft-free-online-games_GM479516143.pdfIn PDF document text
    • http://huananhai.net/images/minecraft-115-2-hacks_GM479516143.pdfIn PDF document text
    • http://huananhai.net/images/free-roblox-thumbnail_GM431946152.pdfIn PDF document text
    • http://huananhai.net/images/minecraft-pe-free-download-ios_GM479516143.pdfIn PDF document text
    • http://huananhai.net/images/coin-master-cheats-and-hacks_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/minecraft-free-online_GM479516143.pdfIn PDF document text
    • http://huananhai.net/images/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/coin-master-free-coins-and-spins-daily-summary_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/robloxheroxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://huananhai.net/images/minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • http://huananhai.net/images/free-24-7-minecraft-server_GM479516143.pdfIn PDF document text
    • http://huananhai.net/images/freerobuxno-games-no-sighning-up_GM431946152.pdfIn PDF document text
    • http://huananhai.net/images/coin-master-game-free-spin-download_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/coin-master-free-spins-link-may-2021_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050f5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50F5 26384 bytes
SHA-256: 711def74bde153e5a06b2cd493c00a5b8067acf42fb568af831819ac40bdec1a
font_01_sfnt_off00008df6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DF6 3400 bytes
SHA-256: 4b3e0f36ad1e0c7e3ea5c178fd2b4f097d1e01575fc6a4101a8b520db34dfe07
font_02_sfnt_off00009920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9920 19168 bytes
SHA-256: 0a7d6833eade871766ff7eb171c26f7c4bb956cf15fff666beac1d77449a13e8

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