Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7c9cfc40a65647e…

MALICIOUS

PDF

42.1 KB Created: 2021-05-10 15:19:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a39f71b5d383f36f092c3891033750cd SHA-1: f699c85c8f4cde84d1cc0d57d64b89ce5f2e6589 SHA-256: c7c9cfc40a65647ee4b0fb3963602b169bd4b261aeda73f43d0ce872add176a0
160 Risk Score

Malware Insights

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

The PDF document contains multiple links to external websites, including a known malicious redirector disguised as a 'game hack' generator. The presence of these links, combined with the ML classifier flagging this PDF as malicious, strongly suggests an attempt to lure the user into downloading a payload or visiting a malicious site. No scripts were extracted, but the document's structure and embedded URLs point to a social engineering attack.

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/406889139/coin-master-free-spins-link-download-apk-game-hack In PDF document text
    • http://pustaka.fti.unand.ac.id/repository/robux-money_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/robux-earning-websites_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/coin-master-hack-ios-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/100-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/how-to-hack-someones-account-on-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/minecraft-hack-app_GM479516143.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/archery-master-3d-hack-unlimited-coins-cheats_GM406889139.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/robux-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/free-bling-bling-card-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/minecraft-free-ios-no-verification_GM479516143.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/free-robux-offers_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/coin-master-rewards-app_GM406889139.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/real-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/how-to-get-coin-master-free-spins-in-email_GM406889139.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/roblox-generator-no-human-verification_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_off00004a4c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A4C 23976 bytes
SHA-256: 3a1eb0a8176d9396935d4ad13ced2ebdf9baa93318ebf46e2403670bd9d72895
font_01_sfnt_off000080ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80ED 18636 bytes
SHA-256: 25357440b967022afdda2762c117e199fe34607d55555ae4de3c7ac45df8a0be

Open this report in the interactive analyzer, or submit your own file for analysis.