Malicious PDF — malware analysis report

Static analysis result for SHA-256 491683165b647131…

MALICIOUS

PDF

35.0 KB Created: 2021-07-03 19:49:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 2365dd8af772ac96b9a834398eb0523c SHA-1: c22f02521dc277d1e981ba2fc867462897bca8da SHA-256: 491683165b647131236b91ac84e841279049233bc7c4356805079cd12f5ddd4c
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high-confidence heuristic indicating it links to a 'free generator / game hack' redirector. The document body and extracted URLs reinforce this, pointing to lures for free Robux and game hacks. The ML classifier also flagged the PDF as malicious with high confidence. No scripts were extracted, but the primary attack vector appears to be a phishing lure leading to a potentially malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/431946152/how-to-get-free-robux-in-2021-game-hack PDF link annotation
    • https://bioscience.kyst.com.tw/image/data/files/free-coinmaster-spins_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/coin-master-game_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/how-to-hack-into-peoples-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/coin-master-hack-quora_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/how-to-hack-roblox-for-admin-commands_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/how-to-hack-roblox-passwords_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/dragon-ball-x-roblox-hack-pc_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/join-this-group-for-free-robux_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/coin-master-free-spins-hack-without-human-verification_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/free-minecraft-capes_GM479516143.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/free-tiktok-likes-no-survey_GM835599320.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/jailbreak-hacks-for-roblox-projec-alph_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/how-to-get-free-robux-groups_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/free-minecraft-worlds_GM479516143.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/cheat-engine-cheat-table-roblox-scripts_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/promo-codes-for-free-stuff-2021-roblox_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/how-to-get-free-robux-easy-on-ipad_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
font_00_sfnt_off0000303b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x303B 22916 bytes
SHA-256: c140c155271566375a969c494f5a2110c7bf82a2d701164536fdb2ef257bf35a
font_01_sfnt_off00006297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6297 19384 bytes
SHA-256: beda04841b54e06a4d18d1cbf02b1b14a72e3f9ac36d377307adf26878c6faf9

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