Malicious PDF — malware analysis report

Static analysis result for SHA-256 776d44b82755989d…

MALICIOUS

PDF

32.9 KB Created: 2021-07-04 20:32:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 58b14ec8cc096e2c53aa26948bd8f4d4 SHA-1: a92223465ecaa423976ad5249f2e9a0fd8224e3b SHA-256: 776d44b82755989d5eb8481381672c7179c2f845e41393b63c51babc47d9d948
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one pointing to known malicious redirector infrastructure at http://netcdn.tw/app/431946152/lazyblocks-com-free-robux-game-hack. The document body and heuristics suggest a lure for game hacks or generators, indicating a phishing or scam attempt. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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/431946152/lazyblocks-com-free-robux-game-hack In PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-get-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-create-roblox-hack-place_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/robux-hacks-2021_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-robux-no-tasks_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/minecraft-free-download-windows_GM479516143.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/minecraft-hack-client-18-9_GM479516143.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-get-war-machine-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/unkown-cheats-roblox_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/best-free-hacked-client_GM479516143.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-get-free-items-on-roblox-no-pastebin_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/roblox-case-clicker-hack-2021_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-hack-fast-org_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/hack-robux-android-fast_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-robux-just-enter-username_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-get-free-robux-no-hack-2021_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-use-patcheds-hacks-for-roblox_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-free-spins-and-coins-generator_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-get-free-robux-that-actually-works_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/huskybuscom-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/cartoon-roblox-character-free_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_off00002a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A1B 21904 bytes
SHA-256: 085d72e1b0123a68e1e1bd32ec10dc8436221522c40662ac52d4641623887c1e
font_01_sfnt_off00005a71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A71 19480 bytes
SHA-256: d59a65bdecbb5c87bb70f1067a6075a20336de1a5b550eccc1c41dc66eb6c340