Malicious PDF — malware analysis report

Static analysis result for SHA-256 17f3be08d7f9af2d…

MALICIOUS

PDF

34.5 KB Created: 2021-07-05 20:58:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 8266cfb00f13231e676b1747ad4dc8e2 SHA-1: 4979152b2d42fc2f157b111cda41f7275dbd6419 SHA-256: 17f3be08d7f9af2d36c3cee56d7aee8cc51e809084a50b542e513e2859a3cb1f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a game hack redirect lure, pointing to malicious infrastructure. The document body and embedded URLs reinforce this, indicating a social engineering attempt to trick users into visiting a malicious site. No scripts were extracted, but the primary attack vector is the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/google-how-do-you-get-free-robux-game-hack In PDF document text
    • https://www.knjiznica-oroslavje.hr/files/how-to-hack-any-roblox-games-unlimited-health_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/coin-master-ids-for-free-spins_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/http-bit-ly-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/free-spins-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/free-tiktok-followers_GM835599320.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/hack-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/how-to-get-free-items-on-roblox-mobile_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/free-robux-generator-no-human-verification-or-survey-or-offers_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/free-roblox-giveaway-accounts_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/appsmob-info-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/coin-blogspot_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/free-coins-coin-master-blog_GM406889139.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/coin-master-game-free-spin-download_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/roblox-exploit-download_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/robux-free-2021_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/free-roblox-boombox_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/roblox-guess-that-character-free-robux_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/dominus-roblox-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_off00002f65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F65 22436 bytes
SHA-256: 8d347595bdbb077bc5fa87ec77be19d954f135b09263be903c19e4bea8ec70f5
font_01_sfnt_off000060c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60C4 19388 bytes
SHA-256: e0d82c167f6ca64f121b23a1748ead6b70296300b19a9978e36a20c70c2cac67

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