Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d3f4fc73a4b8e7e…

MALICIOUS

PDF

43.3 KB Created: 2021-05-17 13:40:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 828d939801261daff90564970eed66b8 SHA-1: cef6d623f880664c097e6950eef02895025f8f1d SHA-256: 8d3f4fc73a4b8e7e0231c3904288cd15d9b7babd90ca458e596e853f5c1e79ea
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure related to game hacks and generators, as indicated by the document body and critical heuristic firings. It contains multiple links to known malicious redirector infrastructure, such as https://netcdn.xyz/app/431946152/i-robux-game-hack, which likely serve to distribute further malware or phishing content. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/i-robux-game-hack In PDF document text
    • http://polycraft.ae/uploaded_files/userfiles/files/free-roblox-executor-no-key_GM431946152.pdfIn PDF document text
    • http://polycraft.ae/uploaded_files/userfiles/files/how-to-hack-coin-master-ios-jailbreak_GM406889139.pdfIn PDF document text
    • http://polycraft.ae/uploaded_files/userfiles/files/coin-master-hack-xyz-download-free_GM406889139.pdfIn PDF document text
    • http://polycraft.ae/uploaded_files/userfiles/files/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • http://polycraft.ae/uploaded_files/userfiles/files/completed-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://polycraft.ae/uploaded_files/userfiles/files/how-to-get-minecraft-java-for-free_GM479516143.pdfIn PDF document text
    • http://polycraft.ae/uploaded_files/userfiles/files/worst-roblox-avatars_GM431946152.pdfIn PDF document text
    • http://polycraft.ae/uploaded_files/userfiles/files/coin-master-hack-spins-and-coins-unlimited-free_GM406889139.pdfIn PDF document text
    • http://polycraft.ae/uploaded_files/userfiles/files/coin-master-coins-free_GM406889139.pdfIn PDF document text
    • http://polycraft.ae/uploaded_files/userfiles/files/coin-master-free-spins-5-10-2021_GM406889139.pdfIn PDF document text
    • http://polycraft.ae/uploaded_files/userfiles/files/coin-master-cheats-for-free-spins_GM406889139.pdfIn PDF document text
    • http://polycraft.ae/uploaded_files/userfiles/files/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://polycraft.ae/uploaded_files/userfiles/files/roblox-hack-download-pc_GM431946152.pdfIn PDF document text
    • http://polycraft.ae/uploaded_files/userfiles/files/is-minecraft-free-on-mac_GM479516143.pdfIn PDF document text
    • http://polycraft.ae/uploaded_files/userfiles/files/how-to-download-minecraft-windows-10-edition-for-free_GM479516143.pdfIn PDF document text
    • http://polycraft.ae/uploaded_files/userfiles/files/coin-master-cheats-free-spins_GM406889139.pdfIn PDF document text
    • http://polycraft.ae/uploaded_files/userfiles/files/coin-master-free-soins_GM406889139.pdfIn PDF document text
    • http://polycraft.ae/uploaded_files/userfiles/files/download-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • http://polycraft.ae/uploaded_files/userfiles/files/how-to-get-free-spins-on-coin-master-android_GM406889139.pdfIn PDF document text
    • http://polycraft.ae/uploaded_files/userfiles/files/roblox-redeem_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_003_off0000486b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x486B 28432 bytes
SHA-256: 175cd9ef41d73d66b05ca13f3dc721c05e5262aae1415fbff8fa129300f165b9
font_01_sfnt_off00008806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8806 17852 bytes
SHA-256: 60f9a9423da9e572e1984add889302644738968a990936a78873c1198bc7dc3d

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