Malicious PDF — malware analysis report

Static analysis result for SHA-256 7894b82ddd49b720…

MALICIOUS

PDF

43.3 KB Created: 2021-06-03 04:15:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 2f15711b32921d51d7920bd890065e46 SHA-1: a57462987a5db98122b9da34fa34dfdac3f36ea3 SHA-256: 7894b82ddd49b72051c16de466d915b3fc8ba50626bba5ec70b7030b31906929
280 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document is designed as a lure, presenting itself as a 'free generator' or 'game hack' to trick users into clicking malicious links. The document contains numerous links to external PDF files and a primary redirector URL, indicating an attempt to lead the user to a malicious site or download. The heuristic 'SE_SECRET_RECOVERY_LURE' suggests the document may also attempt to phish for sensitive credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 6

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.online/app/406889139/coin-master-free-spins-and-coins-for-iphone-game-hack In PDF document text
    • http://library.ulb.ac.id//repository/what-games-on-roblox-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/coin-master-free-spins-no-human-verification_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/mangocheats-com-hack-coin-master-cheat_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/minecraft-pe-hacks_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-play-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-make-a-minecraft-java-server-for-free_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-coin-master-spins-no-human-verification_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/coin-master-free-spin-and-coin-link-app_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/free-bobux_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-free-online-game_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/instant-robux_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/minecraft-ore-finder-mod_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-tiktok-video_GM835599320.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/what-games-give-you-robux_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-hack-codes_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/roblox-hacked-version_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/minecraft-hack-download_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/spin-coin-master-free_GM406889139.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_off00004de0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DE0 24800 bytes
SHA-256: 6b9640efe07451fc81c58964dd0a57a7011860c4b381530ed3a63a5b734152e6
font_01_sfnt_off000086b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86B1 18224 bytes
SHA-256: b4646ab3e358ecd7896173e374a4f37f60f7674218af6eb698aacc488fc1d121

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