Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca4de219c249cae…

MALICIOUS

PDF

49.1 KB Created: 2021-06-03 08:49:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: fc90443515252496482d2ee3c29a6406 SHA-1: 0e21fb2e0e62641b2b305e9fd3eaf8272aea7c45 SHA-256: aca4de219c249caefb7e61cfb7857a1b9ca7450020acc6bdcfb987d1faabf286
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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.online/app/431946152/free-robux-thumbnail-game-hack PDF link annotation
    • https://morishita-tc.com.tw/image/data/files/roblox-free-roblox_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/roblox-hack-game_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/daily-coin-master-free_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/get-free-robux-today_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-robux-2021_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/how-to-change-roblox-username-for-free_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/coin-master-2021-free-spins_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/hack-coin-master-game-apk-download_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/roblox-prison-life-hack_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/minecraft-bedrock-free-server-hosting_GM479516143.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-100-robux_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/pokemon-go-free-year_GM1094591345.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-minecraft-premium-account_GM479516143.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-robux-for-kids-no-verification_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-roblox-boy-hair_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/coin-master-hack-without-verification-code_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/minecraft-ps4-free_GM479516143.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/how-to-give-robux-on-mobile_GM431946152.pdfIn PDF document text
    • https://www.communes.comIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000535c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x535C 26484 bytes
SHA-256: d7fafd5c1c8f9f43ca9bdefd50598a46d19d50ecac804a8f31070955238deec4
font_01_sfnt_off00009208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9208 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00009bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9BF2 18864 bytes
SHA-256: c969eb26f29950990ddccbf0eeab0a7af3119d1c9c7ebc0fee97903357bc58cd

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