Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcbe28342488f0d8…

MALICIOUS

PDF

48.1 KB Created: 2021-06-04 02:09:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: c4270a71df6d564c4fa2f69b094886b8 SHA-1: 2be874135839539eb803019d7baa91b7f299c4af SHA-256: dcbe28342488f0d893fc9b75be1e3ad00583831ea36420c148153310dccb4c80
200 Risk Score

Malware Insights

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

The PDF document employs a fake CAPTCHA lure to trick users into clicking a link that redirects to malicious infrastructure. This is a common social engineering tactic to deliver potentially unwanted or malicious content. No scripts were extracted, but the embedded URLs and heuristic firings strongly indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/free-spins-coin-master-2021-no-verification-game-hack In PDF document text
    • http://laboratorium.sman2metro.sch.id/repository/roblox-pink-free-robux_GM431946152.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id//repository/how-to-hack-coin-master-ios-jailbreak_GM406889139.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id/repository/minecraft-java-hacks_GM479516143.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id//repository/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id/repository/robuxmatchcon_GM431946152.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id//repository/how-to-get-free-gamepasses-on-roblox_GM431946152.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id//repository/coin-master-free-link-spin_GM406889139.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id//repository/how-to-get-robux-fast_GM431946152.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id/repository/coin-master-free-spins-hack-download_GM406889139.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id//repository/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id//repository/coin-master-mod-apk-latest-hack-with-unlimited-free-spins_GM406889139.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id/repository/minecraft-ore-finder-mod_GM479516143.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id/repository/free-minecraft-skin-maker_GM479516143.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id//repository/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id/repository/free-robux-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id//repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id/repository/hack-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id/repository/roblox-sued_GM431946152.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id/repository/lazyblocks-com-free-robux_GM431946152.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id/repository/free-robux-script_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005373.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5373 25540 bytes
SHA-256: 943b3c45f79a8e1e3707371fc78cb8a1723810312aa799ab3452a2c7f0352032
font_01_sfnt_off00008ebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EBB 2880 bytes
SHA-256: b053084cafd01c649462d87667ba56c569d6480ce60e7d20ae57ef6124cf178e
font_02_sfnt_off000098a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x98A6 18420 bytes
SHA-256: 57b0a04a26879f0d3434b42e55f704f41eabe83a94c97134347b08b555bbb634

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