Malicious PDF — malware analysis report

Static analysis result for SHA-256 a57f0cddc03d6876…

MALICIOUS

PDF

46.7 KB Created: 2021-06-11 03:42:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: e67af2636fe5d2ae59ef42635de93700 SHA-1: 582f47010ed3549c52f0fc8bb400e05b54cf828e SHA-256: a57f0cddc03d68766ce368c47b63a605546f2625dba57853bb78b47951ec7f77
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector domains, including one identified as malicious infrastructure. The document body and heuristics suggest a lure for 'free generators' or 'game hacks', which is a common social engineering tactic to trick users into downloading malware. Although no scripts were explicitly extracted, the PDF structure and embedded links strongly indicate a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9748

Heuristics 4

  • 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.
  • 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 https://netcdn.tw/app/431946152/how-to-get-free-robux-on-roblox-2021-ipad-game-hack In PDF document text
    • http://berntfoto.dk/images/roblox-project-pokemon-cheats-2021_GM431946152.pdfIn PDF document text
    • http://berntfoto.dk/images/how-to-get-free-tiktok-coins_GM835599320.pdfIn PDF document text
    • http://berntfoto.dk/images/robux-hack-me_GM431946152.pdfIn PDF document text
    • http://berntfoto.dk/images/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://berntfoto.dk/images/free-running-gamepass-parkour-roblox_GM431946152.pdfIn PDF document text
    • http://berntfoto.dk/images/minecraft-cheats-switch_GM479516143.pdfIn PDF document text
    • http://berntfoto.dk/images/picture-roblox_GM431946152.pdfIn PDF document text
    • http://berntfoto.dk/images/get-free-robux_GM431946152.pdfIn PDF document text
    • http://berntfoto.dk/images/free-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://berntfoto.dk/images/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://berntfoto.dk/images/free-tiktok-followers-and-likes_GM835599320.pdfIn PDF document text
    • http://berntfoto.dk/images/free-100-robux_GM431946152.pdfIn PDF document text
    • http://berntfoto.dk/images/get-coin-master-free-spin_GM406889139.pdfIn PDF document text
    • http://berntfoto.dk/images/how-to-get-free-robux-easy-no-download_GM431946152.pdfIn PDF document text
    • http://berntfoto.dk/images/coin-master-hack-app-link_GM406889139.pdfIn PDF document text
    • http://berntfoto.dk/images/roblox-sword-reach-hack_GM431946152.pdfIn PDF document text
    • http://berntfoto.dk/images/roblox-download-pc-free_GM431946152.pdfIn PDF document text
    • http://berntfoto.dk/images/free-robux-apk_GM431946152.pdfIn PDF document text
    • http://berntfoto.dk/images/offers-for-robux_GM431946152.pdfIn PDF document text
    • http://berntfoto.dk/images/minecraft-windows-10-hack-client-2021_GM479516143.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
stream_004_off00004f34.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F34 24552 bytes
SHA-256: 0ab31b6706b4f1f6cbde87d2989b4d329f9f639e802c0d04dd3567384d7da8a0
font_01_sfnt_off0000867e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x867E 2824 bytes
SHA-256: 94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4
font_02_sfnt_off0000902c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x902C 19336 bytes
SHA-256: c99b02bff48b8868b53b478b99252f73ec854f1292f8f6410c3600996b877fd8

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