Malicious PDF — malware analysis report

Static analysis result for SHA-256 88c77bf8f836a2bb…

MALICIOUS

PDF

33.9 KB Created: 2021-07-03 20:23:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: b426dbfbf87edde482148c543cb27543 SHA-1: 405de4f41663f24ac318bb8886f4a518303cd972 SHA-256: 88c77bf8f836a2bbdea37144c5e4de8b7247c1d3e02e55bd73984c639ffa87c4
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, 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 0.9998

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/406889139/coin-master-hacks-iphone-game-hack PDF link annotation
    • https://deutsch-study.com/image/data/files/how-to-get-free-robux-website_GM431946152.pdfIn PDF document text
    • https://deutsch-study.com/image/data/files/coin-master-hack-software-download_GM406889139.pdfIn PDF document text
    • https://deutsch-study.com/image/data/files/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • https://deutsch-study.com/image/data/files/coin-master-links-for-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://deutsch-study.com/image/data/files/coin-master-free-spinv1-0apkpure-com-apk_GM406889139.pdfIn PDF document text
    • https://deutsch-study.com/image/data/files/coin-master-free-spins-link-today-instagram_GM406889139.pdfIn PDF document text
    • https://deutsch-study.com/image/data/files/roblox-admin-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • https://deutsch-study.com/image/data/files/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • https://deutsch-study.com/image/data/files/huskybuscom-free-robux_GM431946152.pdfIn PDF document text
    • https://deutsch-study.com/image/data/files/coin-master-blogspot-free-spins_GM406889139.pdfIn PDF document text
    • https://deutsch-study.com/image/data/files/how-to-kick-someone-in-free-draw-2-roblox_GM431946152.pdfIn PDF document text
    • https://deutsch-study.com/image/data/files/protosmasher-with-workspace-free-roblox_GM431946152.pdfIn PDF document text
    • https://deutsch-study.com/image/data/files/how-to-get-creative-mode-in-minecraft-server-hack_GM479516143.pdfIn PDF document text
    • https://deutsch-study.com/image/data/files/robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://deutsch-study.com/image/data/files/coin-master-hack-android-root_GM406889139.pdfIn PDF document text
    • https://deutsch-study.com/image/data/files/free-catalog-robloxcom_GM431946152.pdfIn PDF document text
    • https://deutsch-study.com/image/data/files/haktuts-coin-master-free-spin-link-today_GM406889139.pdfIn PDF document text
    • https://deutsch-study.com/image/data/files/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://deutsch-study.com/image/data/files/how-to-make-free-robux_GM431946152.pdfIn PDF document text
    • https://deutsch-study.com/image/data/files/get-free-robux-without-human-verification_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_off00002fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FA4 22464 bytes
SHA-256: ff995a00e3323fae0ba69a272444919d270b582b60c149bb2f328a11e878544c
font_01_sfnt_off00006190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6190 18344 bytes
SHA-256: b25f1f54b32dc8a640253b18bc7ef351ac90ab75378d84f6bf8a3e5536491837

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