Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc919928bc9474ab…

MALICIOUS

PDF

33.9 KB Created: 2021-07-04 18:15:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 1c5cd8893e2ace240a3d76d9ca4f083e SHA-1: 422d93e33a0e74134a5e51256dce954ca6f22b28 SHA-256: bc919928bc9474ab21ad5d204357613c3349180b47c438a50c4cae561681b998
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, including a primary lure for 'free Minecraft hacks' and a large number of other PDF files hosted on 'loba.com.vn'. This suggests a link farm or SEO manipulation tactic. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent, likely to redirect users to potentially harmful content or phishing sites.

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.tw/app/479516143/free-minecraft-hacks-game-hack PDF link annotation
    • https://loba.com.vn/public/upload/files/hack-de-dinero-en-jailbreak-roblox_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/free-roblox-groups-with-funds_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/coin-master-hack-pc-cheat-engine_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/coin-master-hack-apk-with-fb-login-2021_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/how-to-get-free-stuff-on-roblox-mobile-2021_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/roblox-hack-siteleri_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/how-to-get-free-robux-on-android-2021_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/game-hack-36-roblox_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/robux-redeem_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/coin-master-34-5-hack_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/roblox-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/hack-coin-master-apk-32-download_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/free-minecraft-skins-ps4_GM479516143.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/roblox-the-best-clothes-for-free_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000030e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30E8 22396 bytes
SHA-256: f0af5549fcb70b55dc4ef214357b7fa2d90983bdda31ac103402d936f3516959
font_01_sfnt_off000062c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62C8 18024 bytes
SHA-256: 8f8fda7ec61391a8021437fea0b23093d98da4680992c9daa6c8728c6d82e4f2

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