Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9d8f2bb4f8e3cf2…

MALICIOUS

PDF

34.8 KB Created: 2021-05-23 08:34:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 95423b7ede2b47c822e2c7a419c912ac SHA-1: 67f030e7f4877bb81e07dbde423514fe5ad5add7 SHA-256: f9d8f2bb4f8e3cf2439b0a3274bcafe7723bdc1b7ed8783e0a4a4c852e201487
160 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirector infrastructure, specifically advertising 'free Robux' or 'game hacks' to entice clicks. The ML classifier also flagged this PDF with high confidence. The document body and embedded URLs strongly suggest a lure for further malicious activity, likely involving the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9508

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/431946152/earn-free-robux-for-roblox-game-hack In PDF document text
    • http://junktiquecollector.com/images/coin-master-spins-free-2021_GM406889139.pdfIn PDF document text
    • http://junktiquecollector.com/images/google-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://junktiquecollector.com/images/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://junktiquecollector.com/images/free-foxy-food-coin-master_GM406889139.pdfIn PDF document text
    • http://junktiquecollector.com/images/how-do-you-get-free-roblox_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_off00002e59.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2E59 24824 bytes
SHA-256: 42a19622f0bc207727ba1e875c50a4348bbb15bc98b4d57d09ae6f4940e95775
font_01_sfnt_off00006694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6694 18316 bytes
SHA-256: 81577c12f28394e63c3fe269139937f952c5f2f271c4ac7315843a65914bc4b9

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