Malicious PDF — malware analysis report

Static analysis result for SHA-256 8acdc5eb47f69a1d…

MALICIOUS

PDF

41.9 KB Created: 2021-05-13 22:50:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 512a45154281c6174b8c1b9469890017 SHA-1: c053643d20b0d1684930c8a1569a0d764d29a266 SHA-256: 8acdc5eb47f69a1d09a8a409bdb1ecfd641a7dc582cbc8cb1ec47ff9ccdba901
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 0.9971

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 https://netcdn.xyz/app/406889139/coin-master-hack-tool-exe-game-hack PDF link annotation
    • https://verstricktundzugenaeht.com/images/games-that-give-free-robux_GM431946152.pdfIn PDF document text
    • https://verstricktundzugenaeht.com/images/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://verstricktundzugenaeht.com/images/how-to-get-free-robux-without-email_GM431946152.pdfIn PDF document text
    • https://verstricktundzugenaeht.com/images/rblx-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://verstricktundzugenaeht.com/images/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • https://verstricktundzugenaeht.com/images/how-to-get-2021-robux-for-free_GM431946152.pdfIn PDF document text
    • https://verstricktundzugenaeht.com/images/coin-master-free-gold-cards-link-2021_GM406889139.pdfIn PDF document text
    • https://verstricktundzugenaeht.com/images/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • https://verstricktundzugenaeht.com/images/coin-master-hack-no-survey-or-verification_GM406889139.pdfIn PDF document text
    • https://verstricktundzugenaeht.com/images/give-me-free-robux_GM431946152.pdfIn PDF document text
    • https://verstricktundzugenaeht.com/images/coin-master-hack-apk-april-12-2021_GM406889139.pdfIn PDF document text
    • https://verstricktundzugenaeht.com/images/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • https://verstricktundzugenaeht.com/images/how-to-get-free-robux-for-free_GM431946152.pdfIn PDF document text
    • https://verstricktundzugenaeht.com/images/coin-master-app-for-free-spins_GM406889139.pdfIn PDF document text
    • https://verstricktundzugenaeht.com/images/roblox-free-bundles_GM431946152.pdfIn PDF document text
    • https://verstricktundzugenaeht.com/images/how-to-use-redstone_GM479516143.pdfIn PDF document text
    • https://verstricktundzugenaeht.com/images/free-roblox-shirt-templates_GM431946152.pdfIn PDF document text
    • https://verstricktundzugenaeht.com/images/google-roblox-games_GM431946152.pdfIn PDF document text
    • https://verstricktundzugenaeht.com/images/coin-master-hack-unlimited-spins_GM406889139.pdfIn PDF document text
    • https://verstricktundzugenaeht.com/images/roblox-comroblox_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
stream_003_off000048f0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48F0 24808 bytes
SHA-256: 92910a1067bb0bb3664b83dbe8ff8519576ee116c6eb5dd7edfec610cc8c03ee
font_01_sfnt_off00008257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8257 18000 bytes
SHA-256: 4986d21a4b5a0dd9c27fb69bc80aac457c531d809421d21d3eeb28a335a679e5

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