Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b8b0d4bf71196c0…

MALICIOUS

PDF

47.4 KB Created: 2021-06-11 12:19:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: e666f43c95be86386481cf2779b25889 SHA-1: 36d84d80fe6ffafdf89fd6ab0bccfd542b0023e7 SHA-256: 3b8b0d4bf71196c0bc2022071dc5448380f848ccc6aac74d3941d521bfbb1b9a
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to websites offering game hacks and free currency, with one primary link identified as a malicious redirector. The document body and heuristics indicate a lure for users to click these links, likely to download further malware or visit phishing sites. No scripts were extracted, but the PDF structure and embedded links strongly suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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 https://netcdn.tw/app/431946152/roblox-tower-of-hell-hack-game-hack In PDF document text
    • http://digilib.stimlog.ac.id/repository/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/minecraft-diamond-finder-hack_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/hack-roblox-jailbreak-774_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-no-hack-or-human-verification_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/coin-master-free-spin-redeem-code_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/minecraft-pe-free-download-ios_GM479516143.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-robux-reddit_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-coin-master-spins-link-facebook_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/wahts-best-lvl-7-roblox-hack_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-get-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-free-spins-2021-link_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-offline-hack_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/coin-master-free-spin-download_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-website_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-cheat-xbox-one_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-100-spin_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-get-free-roblox-money-2021_GM431946152.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_off00005263.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5263 25028 bytes
SHA-256: 7e82863f0e86bb7e4213fd7c2d907bcdc640142990859e4cc893d936fba1daa8
font_01_sfnt_off00008be7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BE7 2956 bytes
SHA-256: bab8933fc39dc331bc4c1c904a82b1432ab2e02478fa0a59453c98c5c231da8d
font_02_sfnt_off00009607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9607 18344 bytes
SHA-256: 6a5cb9441a851748396e468064fcb27dae7ba17e03b02ed549804fc591c83f99

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