Malicious PDF — malware analysis report

Static analysis result for SHA-256 e67dc7b782835592…

MALICIOUS

PDF

51.4 KB Created: 2021-05-16 14:35:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 8f3f2cd02646565c7f08896a0c33e21f SHA-1: ac892ac9db1793c32f3e2a15a0785196580837a7 SHA-256: e67dc7b782835592e17cd302f8ab0be4766e1fec4f4990313678cf9309aa5217
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one to a known malicious redirector, designed to lure users into downloading game hacks or generators. The document body and heuristics indicate a focus on 'Coin Master' and 'Roblox' cheats, suggesting a phishing or scam attempt. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious workflow designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8646

Heuristics 5

  • 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.
  • 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.
  • 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/406889139/coin-master-apk-hack-download-game-hack In PDF document text
    • https://learnwmf.org/image/data/files/roblox-april-fools-hack_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/good-free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/free-printable-roblox-coloring-pages_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/coin-master-free-food_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/free-coin-master-spins-without-human-verification_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/get-free-gold-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/promo-codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/coin-master-free-spins-link-2021-download_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/free-minecraft-account-generator_GM479516143.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/coin-master-reward-link-2021_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/minecraft-free-app_GM479516143.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/coin-master-free-spins-daily-link-game-mod_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/hack-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/minecraft-bedrock-download-pc-free_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004feb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FEB 25136 bytes
SHA-256: 45f3aa76475f647f546723e62429f6d7f1a8e52d6f010fb8d7d36a0092e8adf9
font_01_sfnt_off00008a4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A4E 5372 bytes
SHA-256: 649f28b23eae40bf9fa6a6356ae44d27b1563c479fd61d239aaec50a983c8035
font_02_sfnt_off00009bf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9BF7 2788 bytes
SHA-256: 6fd7c7f447d66842f81aa8cf197935b17f22157d0c7e9f95622df1b5b4ddf530
font_03_sfnt_off0000a5e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA5E7 18472 bytes
SHA-256: 0e3831818f38ae56d02806b9c0b62f33b1ecd4ca65c3265caa2049c7f667b959

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