Malicious PDF — malware analysis report

Static analysis result for SHA-256 c39db7fe512381e5…

MALICIOUS

PDF

34.1 KB Created: 2021-06-29 03:12:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 6f6a0c2443bb908320acfd0d2ec3d975 SHA-1: 7ef99b8b0ada1eaab5dcef707f8c4a995f706499 SHA-256: c39db7fe512381e5635c20ffced61882ea626deb174b145793eeba18423ca1ea
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are SEO-optimized to appear as legitimate guides for game hacks and cheats. The primary lure is for 'Roblox Online Hack For Free Robux', directing users to a suspicious URL. The presence of a link farm and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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 http://netcdn.co/app/431946152/roblox-online-hack-for-free-robux-game-hack PDF link annotation
    • https://www.cow-style.com.tw/upload/files/how-to-hackin-anybody-account-in-roblox_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/roblox-free-robux-give-away-lve_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-minecraft-server-maker_GM479516143.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/roblox-apocalypse-rising-hack_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/how-to-hack-coin-master-ios-jailbreak_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/codes-jeu-hack-roblox_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/minecraft-education-edition-free-download_GM479516143.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-codes-for-assassin-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-robux-apps-that-work_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/roblox-lumber-tycoon-2-hack-windows-7_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/get-free-cards-coin-master_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/cheats-for-the-tales-of-the-ranges-cape-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/coin-master-free-spins-and-coins-app_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/pubg-20210-uc-price_GM1330123889.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/raindrop-hack-roblox-download_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/how-to-get-free-robux-easy-no-download_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/how-to-hack-roblox-without-cheat-engine-2021_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_off00002de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DE1 22508 bytes
SHA-256: db5e9967fea9a86522c2eede313949750eb84abd1e05778a2dedc4521e05b1d4
font_01_sfnt_off0000601d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x601D 19080 bytes
SHA-256: 18d8a94690067cd5f1c88c5681e443164fc334585ecbc91c49f2109e6eb3151c

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