Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a39935fc2ace537…

MALICIOUS

PDF

34.6 KB Created: 2021-07-09 06:26:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 41479c98cfe30c4383f5ab639b7d07e9 SHA-1: 1183e427ef81e20657a37d699029b7a35536d43a SHA-256: 0a39935fc2ace537eb2fb977a3b043e8a19ea2d5082f1ca841301b1a712055e8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links, including one identified as a malicious redirector, designed to lure users with promises of game hacks and free items. The primary link, http://netcdn.tw/app/406889139/wwwcoin-master-free-spincom-game-hack, is associated with a game hack lure. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/wwwcoin-master-free-spincom-game-hack In PDF document text
    • https://ethraa.ae/userfiles/files/hack-roblox-kali-linux_GM431946152.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/but-link-says-free-robux_GM431946152.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/free-robux-for-free_GM431946152.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/coin-master-free-rare-cards_GM406889139.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/coin-master-hack-cydia_GM406889139.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/coin-master-free-spins-hack-ios_GM406889139.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/roblox-phantom-forces-hack_GM431946152.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/free-game-packs-for-coin-master_GM406889139.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/how-to-make-a-minecraft-client_GM479516143.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/how-to-hack-into-any-roblox-account-2021_GM431946152.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/free-games-coin-master_GM406889139.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/how-to-get-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/best-games-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/pokemon-go-free-event-box-april-2021_GM1094591345.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/how-to-get-free-likes-on-tiktok_GM835599320.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/how-to-hack-coin-master-android_GM406889139.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/free-robux-offers_GM431946152.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/robux-apk_GM431946152.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/roblox-free-robux-no-survey-or-download_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
font_00_sfnt_off00003034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3034 22680 bytes
SHA-256: 7f9b4ef85bb02b2655deb30281cd9dd5dede0967e7ae5efa2acb3d9e0d2a915c
font_01_sfnt_off000062f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62F1 18796 bytes
SHA-256: eeaced86f0062c7288dc39ff3c7ba0b43a5fbd4fc53d6f4039d01ac87507abaf

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