Malicious PDF — malware analysis report

Static analysis result for SHA-256 4681e2a7a4269f34…

MALICIOUS

PDF

34.4 KB Created: 2021-06-25 16:53:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d78fea86d1c3ab54db9812cfa7bff04e SHA-1: 236a700595df9d5bc347e6431cac49516c4cae1e SHA-256: 4681e2a7a4269f347eb9b9074185a3865d040bdcadcbfd91fdbbb5d6903b9759
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, including one that redirects to malicious infrastructure, masquerading as a 'free generator / game hack'. The document body and extracted URLs strongly suggest a lure for users seeking in-game currency or cheats. While no scripts were explicitly extracted, the nature of the links and the heuristic firings indicate a phishing or scam attempt, likely intended to lead users to a compromised site or download further malware.

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.co/app/431946152/robux-free-hack-pc-game-hack In PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/free-games-coin-master_GM406889139.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/coin-master-links-for-free-spins_GM406889139.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/get-free-robux-now-easy_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/how-to-hack-roblox-accounts-2021-on-ipad_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/how-to-hack-roblox-and-get-robux-on-first-attempt_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/minecraft-pocket-edition-hack_GM479516143.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/wall-hack-phantom-forces-roblox_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/pubg-uc-and-rp-generator_GM1330123889.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/roblox-sand-simulator-hack-for-android_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/4-step-way-to-get-free-robux-2021-november_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/coin-master-mod-version-free-download_GM406889139.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/free-robux-apps-that-work_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/legit-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/free-coin_GM406889139.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/cheats-coin-master-free-spins-and-news_GM406889139.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/this-server-is-hacked-roblox-id_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/picture-roblox_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/free-robux-app-2021_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_off0000303d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x303D 22244 bytes
SHA-256: cd4bcedb3f5b0ddc2e3e5a2895e04acbf6bfd0dd5f98895842fd48280526a4e5
font_01_sfnt_off000061b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61B7 19040 bytes
SHA-256: 9f715bf93e355154b59bec1bb928b0767e599fef0854542a569cbb710c7ca27d

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