Malicious PDF — malware analysis report

Static analysis result for SHA-256 b42943d9fd69ec5e…

MALICIOUS

PDF

45.4 KB Created: 2021-06-14 01:24:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 935c874d5ebd9a041aa51f0aacadea38 SHA-1: cbb812facec41b8c98364f06b9d543ff0953ff07 SHA-256: b42943d9fd69ec5e253ca1e6075fab145b343664b8cec0f66df6671f22a1acf0
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to websites offering game hacks and free currency, a common lure for phishing or malware distribution. The heuristic firings indicate these links point to known malicious redirectors and a large link farm designed for SEO manipulation. While no scripts were explicitly extracted, the PDF structure itself facilitates these malicious redirects, likely serving as a first-stage lure to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

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.co/app/431946152/tokyo-ghoul-online-hack-roblox-game-hack In PDF document text
    • http://perpus.unpam.ac.id/repository/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/coin-master-hacks-no-human-verification_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/coin-master-daily-bonus_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-robux-cheat-2021_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/coin-master-daily-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/roblox-mad-city-hack-deutsch_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/how-to-play-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/how-to-hack-coin-master-game-without-root_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/roblox-hack-gui_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/how-to-get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-roblox-aimbot_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/coin-master-spin-hack-apk_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/microsoft-roblox-rewards_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/coin-master-hack-spins-apk-download_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/how-to-use-roblox-script-hack_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000494b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x494B 25352 bytes
SHA-256: a8b4ca911ff236f9cee53b1711c9368f5583d172701c1dce25f473066971aabc
font_01_sfnt_off000083b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83B0 2832 bytes
SHA-256: 77ae1c4cffa647a8fd533dfa4102e94364989f9e80b9cd131876e9d1005899a2
font_02_sfnt_off00008d60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D60 18788 bytes
SHA-256: a3399c1397bca2f22ec93be96fd712722ea82abffd2399613771d8e4c10e6dfa

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