Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccb8e3196f5cd7f6…

MALICIOUS

PDF

35.7 KB Created: 2021-07-06 00:32:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 160a73b787e4e3fe9e7d1bfad0e730a7 SHA-1: 4728c4e7430e2a060a0be3b36e6d97e7c4c39428 SHA-256: ccb8e3196f5cd7f6a8df75a8ece3318fb7ac39dcaf4961503fa5461f642c9bc6
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to websites that claim to offer free game hacks and in-game currency, such as Robux and Coin Master spins. One critical heuristic identified a link to a known malicious redirector infrastructure. The document body and embedded links suggest a lure for users seeking cheats or exploits, which is a common tactic for distributing malware or conducting phishing. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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.tw/app/431946152/how-to-get-free-robux-hack-2021-game-hack In PDF document text
    • https://www.punnitohana.com/uploaded_files/userfiles/files/minecraft-for-free-apk_GM479516143.pdfIn PDF document text
    • https://www.punnitohana.com/uploaded_files/userfiles/files/how-to-hack-a-roblox-server-and-save-it_GM431946152.pdfIn PDF document text
    • https://www.punnitohana.com/uploaded_files/userfiles/files/coin-master-free-spin-app-2021_GM406889139.pdfIn PDF document text
    • https://www.punnitohana.com/uploaded_files/userfiles/files/free-robux-how-to_GM431946152.pdfIn PDF document text
    • https://www.punnitohana.com/uploaded_files/userfiles/files/egg-farm-sim-roblox-hack-script_GM431946152.pdfIn PDF document text
    • https://www.punnitohana.com/uploaded_files/userfiles/files/free-robux-no-verify_GM431946152.pdfIn PDF document text
    • https://www.punnitohana.com/uploaded_files/userfiles/files/free-spin-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.punnitohana.com/uploaded_files/userfiles/files/free-coins-for-planet-master-game_GM406889139.pdfIn PDF document text
    • https://www.punnitohana.com/uploaded_files/userfiles/files/free-robux-no-generator_GM431946152.pdfIn PDF document text
    • https://www.punnitohana.com/uploaded_files/userfiles/files/how-to-get-minecraft-for-free-on-mobile_GM479516143.pdfIn PDF document text
    • https://www.punnitohana.com/uploaded_files/userfiles/files/coin-master-free-spins-without-verification_GM406889139.pdfIn PDF document text
    • https://www.punnitohana.com/uploaded_files/userfiles/files/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
    • https://www.punnitohana.com/uploaded_files/userfiles/files/pop-slots-free-vegas-casino-slots-machine-game-coin-master_GM406889139.pdfIn PDF document text
    • https://www.punnitohana.com/uploaded_files/userfiles/files/roblox-boombox-gear-free_GM431946152.pdfIn PDF document text
    • https://www.punnitohana.com/uploaded_files/userfiles/files/overblox-scipt-hack-roblox_GM431946152.pdfIn PDF document text
    • https://www.punnitohana.com/uploaded_files/userfiles/files/free-spins-on-coin-master-link_GM406889139.pdfIn PDF document text
    • https://www.punnitohana.com/uploaded_files/userfiles/files/free-robux-just-enter-username_GM431946152.pdfIn PDF document text
    • https://www.punnitohana.com/uploaded_files/userfiles/files/roblox-groups-that-give-free-robux_GM431946152.pdfIn PDF document text
    • https://www.punnitohana.com/uploaded_files/userfiles/files/get-more-robux_GM431946152.pdfIn PDF document text
    • https://www.punnitohana.com/uploaded_files/userfiles/files/cheat-codes-for-coin-master_GM406889139.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_off00003481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3481 21944 bytes
SHA-256: 23f1ab12950f46c566d8abff012a0d3ad793d78fb943febb5e5e5d942881682e
font_01_sfnt_off000064e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64E7 19556 bytes
SHA-256: f212cd4c9928ae438aa9e71512a10d010177ec0841fcd267cfedc658cf456714

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