Malicious PDF — malware analysis report

Static analysis result for SHA-256 a673644c3b61e847…

MALICIOUS

PDF

44.5 KB Created: 2021-06-03 10:42:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: efd99e17617947935398430919bfe2a3 SHA-1: c90e3517da6ca9e090ba7c90ce5c4643781845a6 SHA-256: a673644c3b61e84720c32c706badc7edda62c9c4e53dc17f9f9e17b51a69f3ab
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple links that redirect to malicious infrastructure, specifically promoting 'game hacks' and 'free generators'. The document body and heuristics indicate a lure to download potentially unwanted or malicious software. The presence of a visual download button and password protection instructions further support a malicious workflow designed to bypass security controls.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.online/app/406889139/coin-master-32-hack-apk-download-game-hack In PDF document text
    • http://digilib-pps.unja.ac.id/repository/easy-robux-hack_GM431946152.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/pubg-uc-2021-free_GM1330123889.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/coin-master-free-spins-link-today-blogspot_GM406889139.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/how-can-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/unlimited-robux-2021_GM431946152.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/how-to-hack-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/pubg-uc-top-up_GM1330123889.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/get-1b-robux-free-no-hacks-roblox_GM431946152.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/free-roblox-outfits-2021_GM431946152.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/coin-master-online-hack-tool_GM406889139.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/minecraft-fly-hack_GM479516143.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/coin-master-hack-programers_GM406889139.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/spins-gratis-coin-master-hoy_GM406889139.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/free-coins-and-spins-for-coin-master-game_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_004_off000050d7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50D7 24776 bytes
SHA-256: 21450ee4871bb652848c3ed72faacceef918019dbf80c08b25f64b5aa71355a5
font_01_sfnt_off00008976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8976 18768 bytes
SHA-256: 3c91c03bd7456db9b9e4fbee6fb625b8bd453fb2d6a3fc152298d538b433522d

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