Malicious PDF — malware analysis report

Static analysis result for SHA-256 b175d3b4ab1ffcc4…

MALICIOUS

PDF

34.0 KB Created: 2021-07-05 08:33:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 5743e853c66b031b4e036e972ac46fae SHA-1: 39f244c1ca7689ed468a58f02101dbca954ab1fe SHA-256: b175d3b4ab1ffcc4eee75204ae53306c794fe9972930145033cc4d5750345914
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirectors and potentially malicious files, masquerading as game hacks and free generators. The primary link, http://netcdn.tw/app/406889139/coin-master-free-spins-and-coins-2021-game-hack, is identified as a malicious redirector. The document body and embedded URLs suggest a lure for users seeking in-game currency or cheats, which is a common social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/coin-master-free-spins-and-coins-2021-game-hack In PDF document text
    • http://gts.edu.gh/library/repository/pirates-wrath-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-free-spins-link-2021-twitter_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-printable-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-to-get-free-robux-on-a-computer-2021_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/minecraft-java-edition-download-free_GM479516143.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/impact-hack-roblox-download_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-robux-no-verification-no-download_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-robux-no-human-verification-2021-or-survey_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-guide-to-free-spins-and-rewards_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-cards-free-cards_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-free-spins-generator-no-human-verification_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/roblox-hack-app_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-robux-with-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-roblox-exploits-no-download_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/roblox-ip-tracker-hack_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/roblox-script-hack_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/flob-fun-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/roblox-ingame-item-hack_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-daily-free-spins-link-facebook_GM406889139.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_off00002f73.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F73 22232 bytes
SHA-256: 8e9f72d5d6c172a222a4e45c765eb830c337bc466c8f23a15df5860432df6208
font_01_sfnt_off000060a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60A7 18752 bytes
SHA-256: e4aa4bc966ade2ebd198d7ae698a70c714723bf3d78331a5c03b975dc9a7ea7a

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