Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c8436acb834d7eb…

MALICIOUS

PDF

58.6 KB Created: 2021-05-19 17:07:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: da3312c2c01acfa8c93fa4d88d69494c SHA-1: c23a262f577dadba760a84c4f10a6eb77af538e9 SHA-256: 3c8436acb834d7eb3185498cb391fb35fbe5874f566d5128ac187f52c49fea5a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and is designed as a lure for 'game hacks'. The embedded URLs, such as 'https://netcdn.xyz/app/431946152/hack-download-game-hack', likely lead to the download of further malicious content or unwanted software. The document body, though partially corrupted, contains references to game hacks and download prompts, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8458

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/hack-download-game-hack In PDF document text
    • https://abellamoveis.com.br/ckfinder/userfiles/files/roblox-com-hack_GM431946152.pdfIn PDF document text
    • https://abellamoveis.com.br/ckfinder/userfiles/files/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • https://abellamoveis.com.br/ckfinder/userfiles/files/how-to-get-free-spins-on-coin-master-android_GM406889139.pdfIn PDF document text
    • https://abellamoveis.com.br/ckfinder/userfiles/files/100-robux_GM431946152.pdfIn PDF document text
    • https://abellamoveis.com.br/ckfinder/userfiles/files/free-minecraft-skins-xbox-one_GM479516143.pdfIn PDF document text
    • https://abellamoveis.com.br/ckfinder/userfiles/files/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • https://abellamoveis.com.br/ckfinder/userfiles/files/free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • https://abellamoveis.com.br/ckfinder/userfiles/files/coin-master-hacks-for-free-spins_GM406889139.pdfIn PDF document text
    • https://abellamoveis.com.br/ckfinder/userfiles/files/coin-master-free-spins-2021-apk_GM406889139.pdfIn PDF document text
    • https://abellamoveis.com.br/ckfinder/userfiles/files/how-to-really-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://abellamoveis.com.br/ckfinder/userfiles/files/coin-master-download-hack-ios_GM406889139.pdfIn PDF document text
    • https://abellamoveis.com.br/ckfinder/userfiles/files/get-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://abellamoveis.com.br/ckfinder/userfiles/files/getrobux-ninja_GM431946152.pdfIn PDF document text
    • https://abellamoveis.com.br/ckfinder/userfiles/files/roblox-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://abellamoveis.com.br/ckfinder/userfiles/files/getrobux-come_GM431946152.pdfIn PDF document text
    • https://abellamoveis.com.br/ckfinder/userfiles/files/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • https://abellamoveis.com.br/ckfinder/userfiles/files/all-links-for-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://abellamoveis.com.br/ckfinder/userfiles/files/blox-fish-free-robux_GM431946152.pdfIn PDF document text
    • https://abellamoveis.com.br/ckfinder/userfiles/files/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdfIn PDF document text
    • https://abellamoveis.com.br/ckfinder/userfiles/files/roblox-booga-booga-hack_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004af6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AF6 39612 bytes
SHA-256: ae4a17f652174eda45db1704ea1b27f8089e5db8130e9086a543b7cbf9ec2fb6
font_01_sfnt_off0000a09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA09F 2824 bytes
SHA-256: 94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4
font_02_sfnt_off0000aa48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA48 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_03_sfnt_off0000b74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB74E 3120 bytes
SHA-256: 49734f51977507cba6bc8d3ad0cee0363aa119856db094427deb9cf565bb7bca
font_04_sfnt_off0000c262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC262 18320 bytes
SHA-256: d1c8e8c65baa96442d6d687c0ecc4ed575715aad60d34b47b8ab6e4b5accbb3c