Malicious PDF — malware analysis report

Static analysis result for SHA-256 63dd309b44d3bc1e…

MALICIOUS

PDF

35.2 KB Created: 2021-07-08 19:48:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 07e7fcb39140ae192d7d49eec17eed31 SHA-1: f1d9a72a9906786fde2e542391dd5303f085f2d3 SHA-256: 63dd309b44d3bc1e6c2c6f49ee1b2c96ca42f42edd026ea324d35d04a6955dd6
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to known malicious infrastructure, specifically a site offering 'free Robux' and game hacks. The document body and heuristics indicate a lure designed to trick users into visiting these sites, likely as a precursor to further malicious activity such as malware download or credential harvesting. No scripts were extracted, but the malformed stream and redirector links are strong indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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 http://netcdn.tw/app/431946152/free-robux-without-survey-game-hack In PDF document text
    • https://www.alarqam.ae/userfiles/files/headless-head-roblox-free_GM431946152.pdfIn PDF document text
    • https://www.alarqam.ae/userfiles/files/how-to-get-minecraft-windows-10-edition-for-free_GM479516143.pdfIn PDF document text
    • https://www.alarqam.ae/userfiles/files/100-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://www.alarqam.ae/userfiles/files/roblox-hide-and-seek-cheat_GM431946152.pdfIn PDF document text
    • https://www.alarqam.ae/userfiles/files/free-robux-cards_GM431946152.pdfIn PDF document text
    • https://www.alarqam.ae/userfiles/files/roblox-free-hair-girl_GM431946152.pdfIn PDF document text
    • https://www.alarqam.ae/userfiles/files/coin-master-hack-apk-latest-version-2021_GM406889139.pdfIn PDF document text
    • https://www.alarqam.ae/userfiles/files/free-coins-on-coin-master-without-verification_GM406889139.pdfIn PDF document text
    • https://www.alarqam.ae/userfiles/files/free-spin-coin-master-online_GM406889139.pdfIn PDF document text
    • https://www.alarqam.ae/userfiles/files/free-h-robux-game_GM431946152.pdfIn PDF document text
    • https://www.alarqam.ae/userfiles/files/roblox-promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • https://www.alarqam.ae/userfiles/files/minecraft-free-download_GM479516143.pdfIn PDF document text
    • https://www.alarqam.ae/userfiles/files/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.alarqam.ae/userfiles/files/coin-master-free-100-spin-link_GM406889139.pdfIn PDF document text
    • https://www.alarqam.ae/userfiles/files/how-to-get-free-faces-on-roblox-mac_GM431946152.pdfIn PDF document text
    • https://www.alarqam.ae/userfiles/files/coin-master-spin-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.alarqam.ae/userfiles/files/coin-master-apk-hack-35-8_GM406889139.pdfIn PDF document text
    • https://www.alarqam.ae/userfiles/files/coin-master-free-spins-hack-link_GM406889139.pdfIn PDF document text
    • https://www.alarqam.ae/userfiles/files/robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.alarqam.ae/userfiles/files/coin-master-34-4-hack_GM406889139.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
font_00_sfnt_off0000310b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x310B 22256 bytes
SHA-256: 1ac2b8abfb0e17ed3218c4d48622c5ec18ade71e101a540742bfbaabeba82913
font_01_sfnt_off000062c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62C3 19600 bytes
SHA-256: ea618dc0ac89057573f0900fc77451ab5142be89e827617cc4892c329dfdb229

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