Malicious PDF — malware analysis report

Static analysis result for SHA-256 8293d2f75fa54ad3…

MALICIOUS

PDF

47.2 KB Created: 2021-06-09 04:11:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: ab27bcf4d7158192347051e8ae283cb5 SHA-1: da6233cfc971ab9e60bc101ad8c8e7d69fbbc189 SHA-256: 8293d2f75fa54ad35abd726309f67e16b069f5a95bcddce14d8a7a19487093fc
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a link farm strategy, embedding numerous URLs that promise game hacks and free currency to lure users. The primary URL, https://netcdn.tw/app/431946152/invisible-hack-roblox-jailbreak-game-hack, and the extensive list of links hosted on sv-nahetal.de, suggest a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded links strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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.tw/app/431946152/invisible-hack-roblox-jailbreak-game-hack PDF link annotation
    • http://sv-nahetal.de/images/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://sv-nahetal.de/images/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
    • http://sv-nahetal.de/images/get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/coin-master-hack-apk-no-survey_GM406889139.pdfIn PDF document text
    • http://sv-nahetal.de/images/roblox-free-models_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/rbxfree-com-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/minecraft-116-free_GM479516143.pdfIn PDF document text
    • http://sv-nahetal.de/images/coinmaster-links_GM406889139.pdfIn PDF document text
    • http://sv-nahetal.de/images/how-to-get-a-lot-of-robux_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/robuxlove-net-free-robux_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/roblox-free-pastebin-not-patched_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/minecraft-hack-mod_GM479516143.pdfIn PDF document text
    • http://sv-nahetal.de/images/free-robux-giver-no-survey_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/minecraft-auto-miner-hack_GM479516143.pdfIn PDF document text
    • http://sv-nahetal.de/images/coin-master-blogspot-free-spins_GM406889139.pdfIn PDF document text
    • http://sv-nahetal.de/images/how-to-hack-peoples-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004d21.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D21 25736 bytes
SHA-256: e291d0380f15451313f86657323493b405e0a931d02d0527c25b309b505f171f
font_01_sfnt_off000087cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87CB 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off000094dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94DD 18580 bytes
SHA-256: 407315d2ae0281d589a33e43e7ffb01f76367fa924cab0db9f9398f95b13ff9f

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