Malicious PDF — malware analysis report

Static analysis result for SHA-256 410a1c9640456d18…

MALICIOUS

PDF

47.5 KB Created: 2021-06-09 16:30:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d0bedcca4182e08bfc347abea78e2233 SHA-1: 18bf04ad5781515b520328b0442f15a1dbbd72d6 SHA-256: 410a1c9640456d18f05036b4daccdc29c25604969024a00c1a251da32d60a41b
182 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses brand-impersonation credential phishing. 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 0.9769

Heuristics 6

  • 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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.tw/app/431946152/how-to-get-free-robux-on-roblox-december-2021-game-hack.
  • 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 https://netcdn.tw/app/431946152/how-to-get-free-robux-on-roblox-december-2021-game-hack PDF link annotation
    • http://msfs-eastafrica.com/images/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/how-to-cheat-on-eviction-notice-roblox_GM431946152.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/gun-hack-roblox_GM431946152.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/free-robux-22k_GM431946152.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/get-free-tiktok-followers-no-verification_GM835599320.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/free-robux-earn_GM431946152.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/coin-master-free-spin-link-today-50_GM406889139.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/coin-master-hack-app-for-ios_GM406889139.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/how-to-play-minecraft-with-friends-for-free_GM479516143.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/coin-master-heaven-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/how-to-hack-coin-master-android_GM406889139.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/coin-master-hack-ios-cydia_GM406889139.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/how-to-hack-into-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/coin-master-free-gift-link-2021_GM406889139.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F18 25144 bytes
SHA-256: 7bf512f484e5b97979106a067155d2db54de353f94654a2cb0da986a876f2091
font_01_sfnt_off00008795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8795 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_02_sfnt_off0000943c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x943C 19184 bytes
SHA-256: 34ca230e45c2f7556586366bcb864c0ae605989e55cee4796d8e528433f77245

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