Malicious PDF — malware analysis report

Static analysis result for SHA-256 739b77dd2f2bf765…

MALICIOUS

PDF

38.1 KB Created: 2021-05-23 23:43:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 82bbb71f4917c726b40948bdb2a4212a SHA-1: 6a39507f9fb63a0647fe6bdd50f176a29b3d360f SHA-256: 739b77dd2f2bf7653ef0add2a8ea497d67e64f487959730dfa4f1c3e349c9c2b
180 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirectors, specifically advertising 'free robux' and 'game hacks'. The ML classifier also flagged this PDF as malicious. The presence of these links suggests an attempt to direct the user to a site that may host further malicious content or phishing pages. No scripts were extracted, but the document structure and embedded links indicate a lure for potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9407

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/431946152/roblox-free-robux-codes-game-hack In PDF document text
    • http://kishplus.ir/images/free-robux-hack_GM431946152.pdfIn PDF document text
    • http://kishplus.ir/images/can-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://kishplus.ir/images/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://kishplus.ir/images/robux-earner_GM431946152.pdfIn PDF document text
    • http://kishplus.ir/images/huskybuscom-free-robux_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_off00003438.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3438 26764 bytes
SHA-256: fc7315be73990cb5782115672cf782b4a99cb8ced80398c4d083e4e69c3b290c
font_01_sfnt_off000073b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73B3 18260 bytes
SHA-256: 40a15a9049e9412bdd5c9a35f1903570ad5947e976b8939b833c9d7797e77bf9

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