Malicious PDF — malware analysis report

Static analysis result for SHA-256 731d71af139ee6bf…

MALICIOUS

PDF

42.6 KB Created: 2021-05-15 23:20:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: cb91f39fc894ea3332414a0d16ffcd15 SHA-1: 069abafbf8c77ca12f4ea0f409d09c6cbe3e1833 SHA-256: 731d71af139ee6bfcf42dcffa2293c621f663e0658792bc0de6a345bbc991458
160 Risk Score

Malware Insights

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

The PDF document contains embedded links that redirect to a known malicious infrastructure, specifically promoting 'free game hacks' and in-game currency. The ML classifier also strongly indicated maliciousness. The primary attack pattern observed is social engineering via a lure, leading users to potentially malicious sites that may host further exploits or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://netcdn.xyz/app/479516143/minecraft-login-free-game-hack In PDF document text
    • https://opac.umrah.ac.id/repository/martian-lettuce-coin-master-free_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/card-hack-in-coin-master_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/minecraft-aimbot_GM479516143.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-robux-come_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-card-hack-apk_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/minecraft-free-demo_GM479516143.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/roblox-army-free-robux_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-free-spins-through-coin-pop_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/how-to-get-free-spins-on-coin-master-facebook_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/can-you-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/robux-robux_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/how-can-you-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-hack-version-download-2021-ios_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/how-to-hack-coin-master-without-root_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-free-spins-link-no-verification_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/oprewards-com-earn_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/master-coin-hack_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/how-to-get-a-refund-on-roblox-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
stream_003_off00004b0e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B0E 26164 bytes
SHA-256: fddbf9fb2f957e4663e507e30ed2f1cd55030fe73c65dfff2b4990e6b980e089
font_01_sfnt_off00008522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8522 17996 bytes
SHA-256: a07e2ad8fd79bb30e6fc1ebe6b3b8a9b32aa8410594bf0891ac0147b7718a067

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