Malicious PDF — malware analysis report

Static analysis result for SHA-256 804930c2d209f961…

MALICIOUS

PDF

37.1 KB Created: 2021-05-21 12:33:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: ad8b431b92fbc22898848cc2c07e7c36 SHA-1: 081512431292ad95b9279081c314368fec3a3305 SHA-256: 804930c2d209f961a300ef9d3c5208f726f5f0630900a476cd266e7d0859d043
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to a known malicious domain, masquerading as a 'free generator' or 'game hack'. The document body explicitly mentions 'Free Robux Roblox Promo Codes' and includes a call to action to access a generator. The ML classifier also flagged this PDF as malicious, supporting the conclusion that it is designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

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/free-robux-roblox-promo-codes-game-hack In PDF document text
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/coin-master-hack-tool-no-survey_GM406889139.pdfIn PDF document text
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/roblox-generator-com_GM431946152.pdfIn PDF document text
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/free-roblox-glasses_GM431946152.pdfIn PDF document text
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/coin-master-hack-apk-july-29_GM406889139.pdfIn PDF document text
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/free-minecraft-severs_GM479516143.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_off0000332a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x332A 26736 bytes
SHA-256: c1b5973faea252c2cc9755abe08543a7b1bce0a60d599ab250300f53f3638398
font_01_sfnt_off00006ecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6ECC 18676 bytes
SHA-256: 9297a3cb5fba7ca587652f513aa1222127deb04773b45a9c0f6482a9c793d56f

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