Malicious PDF — malware analysis report

Static analysis result for SHA-256 418180de3ce6d545…

MALICIOUS

PDF

37.5 KB Created: 2021-07-10 01:39:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 76bf4f12c81a4a41784f943eb031553b SHA-1: f7877432bf561e1c7ec2dd88607d33e49ec34630 SHA-256: 418180de3ce6d545513778a456e7dcdb8d721029e11a47c217e15999a77b55bd
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, including a known malicious redirector, that promise game hacks and free in-game currency. These lures are designed to trick users into visiting potentially harmful sites, which could lead to further malware downloads or credential harvesting. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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
  • 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-500-free-spins-game-hack In PDF document text
    • https://biospray-online.com/ckfinder/userfiles/files/roblox-avatar-girl_GM431946152.pdfIn PDF document text
    • https://biospray-online.com/ckfinder/userfiles/files/free-robux-by-roblox-events_GM431946152.pdfIn PDF document text
    • https://biospray-online.com/ckfinder/userfiles/files/coin-master-mod-apk-hack_GM406889139.pdfIn PDF document text
    • https://biospray-online.com/ckfinder/userfiles/files/how-to-get-free-robux-games_GM431946152.pdfIn PDF document text
    • https://biospray-online.com/ckfinder/userfiles/files/get-free-robux-fast_GM431946152.pdfIn PDF document text
    • https://biospray-online.com/ckfinder/userfiles/files/roblox-play-as-guest-free_GM431946152.pdfIn PDF document text
    • https://biospray-online.com/ckfinder/userfiles/files/how-to-get-free-admin-roblox-with-cheat-engine_GM431946152.pdfIn PDF document text
    • https://biospray-online.com/ckfinder/userfiles/files/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • https://biospray-online.com/ckfinder/userfiles/files/how-to-give-yourself-free-robux-in-roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • https://biospray-online.com/ckfinder/userfiles/files/minecraft-free-unblocked_GM479516143.pdfIn PDF document text
    • https://biospray-online.com/ckfinder/userfiles/files/can-you-hack-robux_GM431946152.pdfIn PDF document text
    • https://biospray-online.com/ckfinder/userfiles/files/obbys-august-2021-free-robux_GM431946152.pdfIn PDF document text
    • https://biospray-online.com/ckfinder/userfiles/files/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • https://biospray-online.com/ckfinder/userfiles/files/roblox-models-hack-your-account_GM431946152.pdfIn PDF document text
    • https://biospray-online.com/ckfinder/userfiles/files/http-appsmob-info-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://biospray-online.com/ckfinder/userfiles/files/free-2021-robux_GM431946152.pdfIn PDF document text
    • https://biospray-online.com/ckfinder/userfiles/files/how-to-get-free-robux-website_GM431946152.pdfIn PDF document text
    • https://biospray-online.com/ckfinder/userfiles/files/david-games-free-robux_GM431946152.pdfIn PDF document text
    • https://biospray-online.com/ckfinder/userfiles/files/robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://biospray-online.com/ckfinder/userfiles/files/how-to-get-free-duffel-bag-jailbreak-roblox_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_002_off00003cce.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3CCE 22740 bytes
SHA-256: 1e31beddf83cfbc363f3bd9a3271da02ac528efcb53344ed50ab0ba86ab8d0d9
font_01_sfnt_off00006f9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F9B 18480 bytes
SHA-256: b4faaa02a719e70dd2d7ac4c5260ee5fa609bcbd6a666870f8035250f51f6b31

Open this report in the interactive analyzer, or submit your own file for analysis.