Malicious PDF — malware analysis report

Static analysis result for SHA-256 b78d58971d8e88cd…

MALICIOUS

PDF

40.0 KB Created: 2021-05-10 17:07:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 2221c23bfb01610706b9a3e7f692f4fe SHA-1: 62453c5640ac9ec10cf2ecd6563dfba58d1e0ce9 SHA-256: b78d58971d8e88cde78cfcf957560d033a5316e8e550df8eff0bdf8282fd662d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to known malicious infrastructure, specifically advertising free game hacks and generators. The document body and heuristics indicate a lure to download or access potentially unwanted or malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a malicious redirection workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.xyz/app/479516143/best-free-minecraft-hacked-client-game-hack In PDF document text
    • http://huebner-baustoffe.de/images/coin-master-daily-free-spins-link-today-blogspot_GM406889139.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/free-roblox-intros_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/roblox-free-wings_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/roblox-hacks-and-cheats_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/free-minecraft-account-and-password-2021_GM479516143.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/free-roblox-followers_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/free-coin-master-coins-and-spins_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
stream_003_off000042d7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x42D7 24340 bytes
SHA-256: 4b38aada105f3422f02a5dffa9338c70e706f07a1e64399752b95799c31241ca
font_01_sfnt_off00007aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AAD 18200 bytes
SHA-256: dee6b3909f49c7ddbb1ab18ee008f1775ca59041fcbdd753e186a80ce5ffdd4d

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