Malicious PDF — malware analysis report

Static analysis result for SHA-256 818940dd6178a42e…

MALICIOUS

PDF

44.1 KB Created: 2021-06-07 17:47:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: bdb8fdf8524d6fed1a79e6bba392ab60 SHA-1: 244bdc395ef6741f0fcd7ee1985b1f74cc240de3 SHA-256: 818940dd6178a42e41768dc253cc13a391e60c43f1923c426207e931cfde9723
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to malicious infrastructure, specifically promoting 'game hacks' and 'generators' to lure users. The primary redirect URL is https://netcdn.tw/app/431946152/roblox-wanted-money-hack-game-hack, which is associated with known malicious redirectors. The document body and embedded artifacts suggest a social engineering attempt to trick users into visiting these malicious sites, likely to download further malware or engage in phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.tw/app/431946152/roblox-wanted-money-hack-game-hack In PDF document text
    • http://arkivthy.dk/images/free-robux-pins_GM431946152.pdfIn PDF document text
    • http://arkivthy.dk/images/roblox-free-clothes-hack_GM431946152.pdfIn PDF document text
    • http://arkivthy.dk/images/get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://arkivthy.dk/images/minecraft-pe-free_GM479516143.pdfIn PDF document text
    • http://arkivthy.dk/images/roblox-hack-2021_GM431946152.pdfIn PDF document text
    • http://arkivthy.dk/images/como-hackear-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://arkivthy.dk/images/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://arkivthy.dk/images/free-robux-generator-for-kids_GM431946152.pdfIn PDF document text
    • http://arkivthy.dk/images/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://arkivthy.dk/images/free-spin-link-of-coin-master_GM406889139.pdfIn PDF document text
    • http://arkivthy.dk/images/coin-master-daily-free-spins-link-download_GM406889139.pdfIn PDF document text
    • http://arkivthy.dk/images/coin-master-free-spins-link-today-blogspot_GM406889139.pdfIn PDF document text
    • http://arkivthy.dk/images/app-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://arkivthy.dk/images/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://arkivthy.dk/images/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • http://arkivthy.dk/images/coin-master-free-spins-through-coin-pop_GM406889139.pdfIn PDF document text
    • http://arkivthy.dk/images/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • http://arkivthy.dk/images/roblox-i-cheated-for-this-box_GM431946152.pdfIn PDF document text
    • http://arkivthy.dk/images/minecraft-free-install_GM479516143.pdfIn PDF document text
    • http://arkivthy.dk/images/download-hacks-for-roblox-cheating-in-assasin_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004e4e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E4E 24808 bytes
SHA-256: f6cd2d2328ab6fc45a5d0d08e1c6d82407d2ec5f793a10011fbef2dca674de25
font_01_sfnt_off0000871f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x871F 19032 bytes
SHA-256: b2ca2030bd4c37f6927ffb84e0d38608d1f1ebfb7d5ffab2f050b6e8bb4494e1

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