Malicious PDF — malware analysis report

Static analysis result for SHA-256 42f9b04909f5b259…

MALICIOUS

PDF

34.8 KB Created: 2021-06-29 11:47:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 6e6a79596b5d3cbac5c40dd5700436c8 SHA-1: 6b6171bbd53a2efca634d7c68131c6f446d64af9 SHA-256: 42f9b04909f5b25935a2a2d27cca7ca233ae05ef2d781498c2689f6b74270422
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains multiple links to a redirector service that masquerades as a game hack generator. The document body and heuristics indicate a lure for users to click these links, likely to download further malicious content or be directed to phishing sites. The ML classifier strongly flags this PDF as malicious, and the presence of redirector links suggests a multi-stage attack.

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/how-hack-in-roblox-games-game-hack In PDF document text
    • http://library.ulb.ac.id/repository/robuxmatch-com-free-robux_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/testing-5-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/coin-master-hack-without-verification-code_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-minecraft-education-edition_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/best-free-roblox-flight-simulator_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-code-robux-no-fake-2021_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/can-you-make-free-clothes-roblox_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/go-through-walls-roblox-hack_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-hack-in-someones-account-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/easy-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-no-password-required_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-no-verification-easy_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-executors-for-roblox_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-creator-hack_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/copy-and-past-to-hack-roblox_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/master-coin-hack-game_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-cheat-in-growing-up-simulator-in-roblox_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_off00003076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3076 22564 bytes
SHA-256: 56a36f19bbbab345187f5a23be089299bbfaf5269166c06916375faf121121ec
font_01_sfnt_off000062bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62BD 19080 bytes
SHA-256: b18e986a69575028325c3b8c1136814e56d33e1a118215c83322ce9ffa9a95e1

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