Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cd834d181e5d1b8…

MALICIOUS

PDF

35.5 KB Created: 2021-06-11 09:31:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 368dc8690d415085424b489101116933 SHA-1: 72cedf7c8a067052853f878917705ce5d8893e91 SHA-256: 4cd834d181e5d1b86b96b47d10896997241acf6c136ace429491fe4d20e83637
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, including one that masquerades as a game hack. The document body, though heavily obfuscated, contains references to these lures. The primary attack pattern involves tricking the user into clicking these links, likely leading to further malware downloads or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 3

  • 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.
  • 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/gainblox-gg-robux-free-game-hack In PDF document text
    • http://perpus.polimarim.online/repository/coin-master-extra-spins_GM406889139.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/roblox-hacks-2021-for-all-games_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/roblox-studio-create-a-cheat-code_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/roblox-hack-script-impact_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/roblox-hacks-for-pc-2021-download-mods_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/robuxmatch-com-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/coin-master-hack-root_GM406889139.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/roblox-ninja-shirt-free_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/roblox-cheats-and-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/nuevos-cdigos-de-roblox-de-hacks-jailbreak_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/coin-master-free-spin-and-coin-link-app_GM406889139.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/free-robux-no-email_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/roblox-hack-cheat-engine-62_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/roblox-games-with-free-vip-servers_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/how-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/how-do-you-get-roblox-for-free_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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000053dd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53DD 27340 bytes
SHA-256: f22cd145490b1df55442a754cc4797f2de0ac13dcd240b9b9a6b66823d91722e

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