Malicious PDF — malware analysis report

Static analysis result for SHA-256 8529515030f13b9a…

MALICIOUS

PDF

34.4 KB Created: 2021-07-05 20:12:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: b1ada38906c15983c9c7a146b6f0eb00 SHA-1: 0361e6df7f526545452ee63a91b49905cb4d678c SHA-256: 8529515030f13b9ae487bd6463ceddfaeeaec7069ac112fc045c3b0086272416
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, identified as a link farm, that lure users with promises of game hacks and free in-game currency. The primary heuristic indicates a 'free generator / game hack' redirector, and the ML classifier strongly flagged the PDF as malicious. While no scripts were explicitly extracted, the structure and embedded URLs suggest a phishing or scam attempt, likely initiated via spearphishing attachment.

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/406889139/coin-master-daily-free-spins-link-facebook-game-hack PDF link annotation
    • http://lib.mappifhui.org/repository/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/dominus-free-roblox_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/the-underground-war-roblox-cheats_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/tuto-free-animation-2021-roblox_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/robux-para-roblox-gratis-hack_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/horizon-in-roblox-money-hack-may-2021_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/coin-master-tiradas-gratis-link_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/my-account-has-been-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/free-robux-rocash-fast_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/how-to-get-free-robux-with-hacking_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/free-robux-obby-link-in-august-2021_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/games-on-roblox-that-have-free-boombox_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/when-pokemon-go-free-will_GM1094591345.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/dowload-roblox-for-pc-free_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/roblox-free-girl-hair_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/free-roblox-toy-codes-november-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_off00003034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3034 22296 bytes
SHA-256: 279442d1a455919d88477d4176fee7ec127f42f72cc1196383302faf195738c0
font_01_sfnt_off000061ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61EA 18924 bytes
SHA-256: a0d047bda18a8ecd9b1086251fa4bbdb0dcda0080a7233d126ecb60a43623744

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