Malicious PDF — malware analysis report

Static analysis result for SHA-256 85e573f04cbc4824…

MALICIOUS

PDF

34.5 KB Created: 2021-07-07 16:03:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 1da3b01434869d695139159f63caf4cf SHA-1: 575b41a33242582c3c2fcdf5f7e4941bff647e48 SHA-256: 85e573f04cbc48240a076465b351d7bdd9a37726a37b6e44c5751add8f420639
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of free game currency and hacks to entice users. It contains numerous links to external sites, including a known malicious redirector at http://netcdn.tw/app/406889139/get-free-spins-coin-master-game-hack, and a large number of SEO-optimized PDF links, suggesting a link farm for traffic generation or further malicious redirection. No scripts were extracted, but the document structure and embedded URLs indicate a phishing or scam attempt.

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/406889139/get-free-spins-coin-master-game-hack In PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/minecraft-windows-10-free-trial_GM479516143.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/bloxawards-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/btools-hack-roblox-free-download_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-get-robux-from-3-invites-free-nitro_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-stuff-in-roblox-2021_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-hack-for-android_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/unlimited-spin-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-hack-pc-free_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/ear-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/minecraft-java-hacks_GM479516143.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/hacks-for-robux-no-human-verifycation_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-roblox-game-card-pins_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-and-fortnite-bee-swarm-sim-free-eggs_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-roblox-stuff-catalog_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-free-online-without-sign-in_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-roblox-no-clicps_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-hack-any-user-in-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-free-spin-redeem-code_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_off00003070.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3070 23200 bytes
SHA-256: 9d274071eda04550a3072d69c15a078491f879e128ad82a36783e91a46ae74dc
font_01_sfnt_off000064a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64A3 18176 bytes
SHA-256: 4615fa8d24c7ab701dc83bbe602e927cac2a2c7f7d4d6f21c8af2f2227b09e12

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