Malicious PDF — malware analysis report

Static analysis result for SHA-256 e42bc50318e3847c…

MALICIOUS

PDF

35.7 KB Created: 2021-07-04 17:42:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-02
MD5: c1b10bce4e1ecc92bf74b8cc0c445c40 SHA-1: 7462c54cc94bc9ca6c2d07101c57e2745f6fffb3 SHA-256: e42bc50318e3847c7e813663e0c2c339b5bb72c52250fb75c7d517ab326b3d40
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of game hacks and free in-game currency to trick users into clicking malicious links. It contains numerous links to redirectors and SEO link farms, indicating a phishing or scamming attempt. The document body and heuristics confirm the malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • 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.
  • 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 http://netcdn.tw/app/431946152/game-guardian-roblox-invisible-hack-game-hack In PDF document text
    • http://lib.untad.ac.id/repository/german-free-robux-server_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/free-robux-kid-friendly-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-robux-fast-and-easy-2021_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-robux-giveaway-no-hacks_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/hack-trouver-les-mdp-roblox_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/robux-hack-tips_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/blogger-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/backdoor-currency-increase-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-free-items-thumbnail_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-do-you-get-robux-on-roblox-for-free-2021_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/comment-hack-sur-roblox-strucid_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-hack-app-android-download_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/tiktok-free-folowers-75_GM835599320.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/redeem-promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coolkid-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-heaven_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/bug-free-uniform-of-roblox_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-ninja-simulator-2-cheat-engine_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000032d3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32D3 22904 bytes
SHA-256: 159bab3f43eb8d64a420e4d5c17d0276c47f24b36f413790bcdf630df9f966e8
font_01_sfnt_off0000660c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x660C 19280 bytes
SHA-256: 468b6aa757038214276855d064c27116857d348308cadfda3edc8bb70f137bef

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