Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c933df410434679…

MALICIOUS

PDF

52.9 KB Created: 2021-06-11 10:04:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: dceb5cc5566e278c14bc27f621c6ccb0 SHA-1: e593caaf70e7081685d3cd50c6e17513fb238925 SHA-256: 7c933df410434679749003c915e7f16fde88df02b14dc1be28b553782d5298a5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link disguised as a "free generator / game hack" lure, which is a common social engineering tactic. This link redirects to malicious infrastructure, indicating a phishing or scam attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a malicious intent to redirect users to potentially harmful content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9614

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 https://netcdn.tw/app/431946152/get-your-free-robux-today-game-hack In PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-get-free-premium-roblox_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/roblox-free-accessories-2021_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/minecraft-noob-vs-pro-vs-hacker-vs-god_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-get-free-stuff-on-roblox-inspect_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-premium-roblox_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-cracked-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coinmaster-free-cards_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-robux-with-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-hack-peoples-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-robux-console_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-free-spins-2021-blogspot_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-robux-script_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/instant-robux_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-change-roblox-name-for-free_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/hack-mod-coin-master_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/pokemon-go-free-gift_GM1094591345.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
stream_004_off000051f1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51F1 34460 bytes
SHA-256: 7cf34df7c94b640c37d53a0f2799d2cfbc750103d583dbc3d886f7b9dd7d0ca2
font_01_sfnt_off00009d9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D9D 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off0000aaaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAAAF 18864 bytes
SHA-256: 2fa15b823bc0110c71ab5bd0a510309f7f957dd90a71bd79b6276576d2db0e60

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