Malicious PDF — malware analysis report

Static analysis result for SHA-256 81c3a2a0c2950e78…

MALICIOUS

PDF

37.6 KB Created: 2021-05-23 13:10:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: c9d98f5baf30cecd57beea4c5b25d8d4 SHA-1: f59f2f5e38660fc91ee30019bd7990cdc83e510a SHA-256: 81c3a2a0c2950e782066abdec7463109f5b7170416ae3b94a92d32f85ba483e7
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF document contains embedded links that redirect to a website offering game hacks, a common lure for social engineering attacks. The 'SE_CLICKFIX' heuristic indicates the document likely instructs the user to perform an action that bypasses security controls, such as running a command. The presence of embedded URLs and the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic strongly suggest the document is designed to lead the user to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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/479516143/minecraft-dungeons-free-download-game-hack In PDF document text
    • http://www.hlad.hr/files/minecraft-hack-client-download_GM479516143.pdfIn PDF document text
    • http://www.hlad.hr/files/free-spins-coin-master-2021-today_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/free-robux-app_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/coin-master-hacks-no-human-verification_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/how-to-get-free-robux-easy_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_off0000360e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x360E 25640 bytes
SHA-256: 61a65ee2d5a54b519c34a6886da0dbb4d19f8773a405392bf8589ef4ee43db93
font_01_sfnt_off00007060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7060 18720 bytes
SHA-256: 9131f8ae0af3742f2152d673706180936bbe7c3ea282a1fb4d0c655f83237649

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