Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ca7ebd52337792d…

MALICIOUS

PDF

33.9 KB Created: 2021-06-26 03:51:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 16361ffe7e9b701b46c2686e48650a13 SHA-1: e13fe83f7475de25187d3dffd9879b3a173a1dc0 SHA-256: 1ca7ebd52337792d88af2f27eff0ca956e0817c5e25b814e637cf5c41fa0462f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to malicious infrastructure, masquerading as a "free Robux generator" or "game hack" lure. The ML classifier strongly indicated maliciousness, and the document body reinforces the lure with game-related keywords. No scripts were extracted, but the primary attack pattern involves social engineering via deceptive links.

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.co/app/431946152/free-robux-generator-2021-no-scam-game-hack In PDF document text
    • https://osk-sibir.ru/images/how-do-i-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://osk-sibir.ru/images/free-spin-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://osk-sibir.ru/images/earn-robux-now_GM431946152.pdfIn PDF document text
    • https://osk-sibir.ru/images/roblox-making-other-people-chat-hack_GM431946152.pdfIn PDF document text
    • https://osk-sibir.ru/images/download-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://osk-sibir.ru/images/free-spins-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • https://osk-sibir.ru/images/best-free-robux-sites_GM431946152.pdfIn PDF document text
    • https://osk-sibir.ru/images/coin-master-freebies-2021_GM406889139.pdfIn PDF document text
    • https://osk-sibir.ru/images/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • https://osk-sibir.ru/images/play-coin-master-online-free_GM406889139.pdfIn PDF document text
    • https://osk-sibir.ru/images/coin-master-village-cost_GM406889139.pdfIn PDF document text
    • https://osk-sibir.ru/images/how-to-sue-roblox_GM431946152.pdfIn PDF document text
    • https://osk-sibir.ru/images/coin-master-hack-100-working_GM406889139.pdfIn PDF document text
    • https://osk-sibir.ru/images/coin-master-email-rewards_GM406889139.pdfIn PDF document text
    • https://osk-sibir.ru/images/coin-master-hack-2021-app_GM406889139.pdfIn PDF document text
    • https://osk-sibir.ru/images/archery-master-3d-unlimited-coins-hack_GM406889139.pdfIn PDF document text
    • https://osk-sibir.ru/images/how-do-i-get-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://osk-sibir.ru/images/coin-master-how-to-get-free-pet-food_GM406889139.pdfIn PDF document text
    • https://osk-sibir.ru/images/all-links-for-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://osk-sibir.ru/images/roblox-restaurant-tycoon-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_off00002cd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CD9 22120 bytes
SHA-256: 0b6aa0d888407935e63f519daff4e31937c438d42a8e9ec7c304ac4ea023e8be
font_01_sfnt_off00005dd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DD7 19480 bytes
SHA-256: fa3e7842a9d7b6abb503dc2567cbff0ad0ce25e0ed1c851820a5bfa6e3ed9dce