Malicious PDF — malware analysis report

Static analysis result for SHA-256 edd3affdadc11e4c…

MALICIOUS

PDF

34.9 KB Created: 2021-07-04 23:24:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 082a6671c171deefd435bec04b48dbf5 SHA-1: 89e2e20cf3c857d575a402022a5409e71028a26b SHA-256: edd3affdadc11e4ca388d7e4a4f8cc955ecf3d96fcff3175146ef063a6232b2f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it links to malicious redirector infrastructure, specifically promoting a 'free generator / game hack'. The embedded URL `http://netcdn.tw/app/406889139/free-redeem-code-for-coin-master-game-hack` is identified as a known malicious redirector. The document body and numerous extracted URLs reinforce the theme of game hacks and free currency, aiming to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/free-redeem-code-for-coin-master-game-hack In PDF document text
    • http://library.asih-husada.ac.id/repository/how-to-make-clothes-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/coin-master-free-coins-and-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/roblox-hacks-download-2021-with-virustotal_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/coin-master-game-hack_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/coin-master-free-spins-without-human-verification_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/hack-para-comprar-robux_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/como-ser-hacker-en-roblox-facil_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/roblox-its-free_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/roblox-hack-2021-apk_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/how-do-i-earn-robux_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/do-coin-master-hacks-work_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/david-games-free-robux_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/free-robux-obby-2021_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/rbx-claim_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/how-do-you-get-robux-for-free-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/coin-master-33-hack-version-download_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/roblox-epic-minigames-hack_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/flob-fun-roblox-hacker_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_002_off000031cb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31CB 22928 bytes
SHA-256: 6d457a933c7b41ac32e1aa7b63c73fc5ed05bb40e6fdcec5f3b5d9f00d928745
font_01_sfnt_off00006578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6578 18432 bytes
SHA-256: c861c688303d0ce30a75b450dc2e1ce34b57c54574c870d49b8c2c1412c8bb94

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