Malicious PDF — malware analysis report

Static analysis result for SHA-256 42b6570052d9a04f…

MALICIOUS

PDF

34.9 KB Created: 2021-07-01 05:08:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: c8bdb1d24262f6255bf80cec71d261ec SHA-1: b137c59137013510ecbe7a07cea567bdef728460 SHA-256: 42b6570052d9a04f89490ab62c3b94da93a387827210ea4766ef55b9380dd2c7
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to websites that appear to be part of a link farm, promising game hacks and virtual currency. One prominent URL, http://netcdn.co/app/431946152/free-clothing-roblox-hack-game-hack, is identified as a malicious redirector. The document body and heuristics indicate a lure for users to click these links, likely leading to malicious content or further downloads. No scripts were extracted, but the overall structure suggests 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.co/app/431946152/free-clothing-roblox-hack-game-hack In PDF document text
    • http://www.pspmrsmmbk.com/cendana//repository/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/roblox-welcome-to-bloxburg-money-hack-luc_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana//repository/free-robux-link_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/instagram-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/roblox-cheats-for-laptop_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/unlimited-gaming-hacks-roblox-generator_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/free-roblox-coder-and-builders_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/free-robux-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/how-to-get-free-spins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana//repository/coin-master-free-chest-link_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/tiktok-free-movies_GM835599320.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/free-robux-no-verification-no-download-2021_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/how-to-cheat-on-ramboredkill-in-roblox-2021-youtube_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/how-to-hack-other-peoples-accounts-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/coin-master-hack-game-download_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/how-to-hack-coin-master-with-game-guardian_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/roblox-play-for-free-without-downloading_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/roblox-download-free-hack_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/roblox-robux-and-tix-hack-free-download-october-2021-update_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
font_00_sfnt_off000031c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31C0 22276 bytes
SHA-256: 60a7ef9e5672cbb6e1003e841b843083ad3013988df8f67deaacdbc0b06253d4
font_01_sfnt_off0000634f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x634F 19212 bytes
SHA-256: 6c86588e9707fa4a64e3a0ca3ec7370ca6bd97b7a3b431a947068e2668cb3c5b

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