Malicious PDF — malware analysis report

Static analysis result for SHA-256 c78aeff481eacb8d…

MALICIOUS

PDF

33.5 KB Created: 2021-07-03 11:42:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 536fbec317ea6fe8b0a7ff6b9f679cf7 SHA-1: a6255a33950ea37edb400033ed8d1443df894c9f SHA-256: c78aeff481eacb8d481c518cfd5b649b386893b9e0c8af4220f72fa951dfca17
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that lead to a malicious redirector, disguised as a lure for free game items. The heuristic firings indicate the PDF links to known malicious infrastructure and employs a common game hack redirector lure. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an intent to redirect the user to a potentially malicious website for further exploitation or credential harvesting.

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/link-for-free-spins-on-coin-master-game-hack In PDF document text
    • http://opac.stieimalang.ac.id/repository/free-coin-master-game_GM406889139.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/how-to-get-free-antlers-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/minecraft-free-download-windows_GM479516143.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/roblox-assassin_GM431946152.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/free-private-minecraft-server_GM479516143.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/coin-master-free-spins-bit-ly_GM406889139.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/free-robux-meme_GM431946152.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/offers-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/how-to-get-free-robux-without-downloading-apps-2021_GM431946152.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/hack-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/roblox-promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/free-account-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/gamefly-cf-free-robux_GM431946152.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/how-to-get-5-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/free-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/pokemon-go-free-0-iv_GM1094591345.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/free-spin-link-for-coin-master_GM406889139.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_off00002eab.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2EAB 22108 bytes
SHA-256: b046fb893ce3d2fac11d774ec7abbbc001adc6a6cd2c0f35a1212bba63d53198
font_01_sfnt_off00005fef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FEF 18344 bytes
SHA-256: f56b0ea85f0f4ceaa4b3226630b5e27c33b435ed9466ab3582cda34df5208c0a

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