Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef06d3577617dcdd…

MALICIOUS

PDF

33.3 KB Created: 2021-07-09 15:19:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 47a446ca839543ca573365231df5d604 SHA-1: 8f9f05c8d9e9582a264c0bfcae075f3420494290 SHA-256: ef06d3577617dcdda4ff20f04789f85373d6fa5b118500626b46d736c93911dc
220 Risk Score

Malware Insights

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

The PDF document contains multiple links to external sites, including a primary redirector URL associated with game hacks and free item generators. The heuristic firings indicate this is a malicious redirector and part of a link farm designed for SEO manipulation. The document body, though partially corrupted, contains text related to game hacks and generators, reinforcing the lure. The primary malicious URL is http://netcdn.tw/app/479516143/minecraft-skins-free-girl-game-hack, which likely serves as a gateway to further malicious content or scams.

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/479516143/minecraft-skins-free-girl-game-hack In PDF document text
    • https://www.ma-plast.hr/files/can-you-get-roblox-for-free-on-xbox-360_GM431946152.pdfIn PDF document text
    • https://www.ma-plast.hr/files/roblox-how-to-get-free-bc-with-cheat-engine_GM431946152.pdfIn PDF document text
    • http://www.ma-plast.hr/files/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://www.ma-plast.hr/files/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • https://www.ma-plast.hr/files/reddit-free-robux_GM431946152.pdfIn PDF document text
    • http://www.ma-plast.hr/files/free-spins-coin-master-2021-today_GM406889139.pdfIn PDF document text
    • https://www.ma-plast.hr/files/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • http://www.ma-plast.hr/files/roblox-free-wings-code_GM431946152.pdfIn PDF document text
    • https://www.ma-plast.hr/files/how-to-get-free-robux-for-pc-2021_GM431946152.pdfIn PDF document text
    • http://www.ma-plast.hr/files/create-a-free-roblox-picture-for-yt_GM431946152.pdfIn PDF document text
    • https://www.ma-plast.hr/files/free-boy-hair-roblox_GM431946152.pdfIn PDF document text
    • https://www.ma-plast.hr/files/game-empire-tycoon-roblox-hack-script_GM431946152.pdfIn PDF document text
    • http://www.ma-plast.hr/files/smurf-backpack-gives-free-robux_GM431946152.pdfIn PDF document text
    • https://www.ma-plast.hr/files/earn-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.ma-plast.hr/files/free-spins-coin-master-november-2021_GM406889139.pdfIn PDF document text
    • http://www.ma-plast.hr/files/how-to-get-hacks-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.ma-plast.hr/files/free-robux-robuxgg_GM431946152.pdfIn PDF document text
    • https://www.ma-plast.hr/files/coin-master-heaven-free-daily-spins_GM406889139.pdfIn PDF document text
    • https://www.ma-plast.hr/files/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • http://www.ma-plast.hr/files/coin-master-free-coins-2021_GM406889139.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_off00002f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F5B 22236 bytes
SHA-256: 476080fbf4677257bf0909da6257f806b823397e319ea2c0c372d3dd87461c41
font_01_sfnt_off0000601b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x601B 18100 bytes
SHA-256: 70cc60e58827411371e7f97bcef6641e7ee3ce3b80f3f16580f1bbb3bdc32b02

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