Malicious PDF — malware analysis report

Static analysis result for SHA-256 74b2981304dbca2a…

MALICIOUS

PDF

42.1 KB Created: 2021-05-15 23:05:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 10ae0df3e2328519b2f7ac18d90cedbd SHA-1: 1105440352a55654b06e9f98186d7edb4354ae0f SHA-256: 74b2981304dbca2a9aa248bf2a3671160ae80cc1dd750a844a669f1e1d5a0415
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites that promise free game hacks and generators, such as 'mcpe-free-download-game-hack' and various robux/coin master related links. This behavior is indicative of a lure to download potentially malicious software or engage in phishing activities. The ML classifier strongly supports the malicious nature of this PDF.

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/479516143/mcpe-free-download-game-hack PDF link annotation
    • http://foo.com.tw/files/get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/hack-coin-master-using-pc_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/coin-master-hack-online_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • http://foo.com.tw/files/coin-master-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/free-robux-exe_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/daily-free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/coin-master-free-spins-link-download-apk_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/roblox-weird_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/coin-master-hack-ios-2021_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/50-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/hack-version-of-coin-master-apk-download_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/coin-master-gold-cards-hack-2021_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/how-to-get-minecraft-java-free_GM479516143.pdfIn PDF document text
    • http://foo.com.tw/files/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/will-minecraft-dungeons-be-free_GM479516143.pdfIn PDF document text
    • http://foo.com.tw/files/free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/minecraft-ps4-free_GM479516143.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_off000047b4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47B4 25484 bytes
SHA-256: b90774cd9a456773bf1f36e6c64cdb0781880f2c8642d28144be0ee9e2c7e9ba
font_01_sfnt_off00008219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8219 18240 bytes
SHA-256: 9a1f81bbc101413fe43a9b313857328452ece1c5d1a1f8b03e9ae928595b3df1

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