Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfe4d01f66721e36…

MALICIOUS

PDF

41.9 KB Created: 2021-05-19 21:00:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: af5ccf8e17ac4ca52c3b27860727408c SHA-1: a46ac8d4fd699102f68784d116d138fc655b8787 SHA-256: dfe4d01f66721e360d55e3eb2f7ef6ab4169912c2adf25582e079e57866c67f2
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generators' and 'hacks' for games. The ML classifier strongly indicated maliciousness, and the presence of numerous SEO-optimized PDF links suggests a link farm designed to drive traffic to potentially harmful sites. While no scripts were directly extracted, the PDF structure itself facilitates these malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://netcdn.xyz/app/406889139/coin-master-free-spins-game-hack In PDF document text
    • http://korporacjaroma.pl/images/free-account-roblox-with-robux_GM431946152.pdfIn PDF document text
    • http://korporacjaroma.pl/images/is-minecraft-free-on-pc_GM479516143.pdfIn PDF document text
    • http://korporacjaroma.pl/images/roblox-trolling_GM431946152.pdfIn PDF document text
    • http://korporacjaroma.pl/images/get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://korporacjaroma.pl/images/is-minecraft-free-on-switch_GM479516143.pdfIn PDF document text
    • http://korporacjaroma.pl/images/coin-master-links-for-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://korporacjaroma.pl/images/www-bandicam-com-free-robux_GM431946152.pdfIn PDF document text
    • http://korporacjaroma.pl/images/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • http://korporacjaroma.pl/images/roblox-sexually-abused_GM431946152.pdfIn PDF document text
    • http://korporacjaroma.pl/images/how-to-get-minecraft-pe-for-free-ios_GM479516143.pdfIn PDF document text
    • http://korporacjaroma.pl/images/coin-master-daily-free-spins-link-today-2021-free_GM406889139.pdfIn PDF document text
    • http://korporacjaroma.pl/images/coin-master-redeem-code-free_GM406889139.pdfIn PDF document text
    • http://korporacjaroma.pl/images/get-robux-today_GM431946152.pdfIn PDF document text
    • http://korporacjaroma.pl/images/roblox-hack-2021_GM431946152.pdfIn PDF document text
    • http://korporacjaroma.pl/images/is-minecraft-free-on-xbox_GM479516143.pdfIn PDF document text
    • http://korporacjaroma.pl/images/roblox-apk-hack_GM431946152.pdfIn PDF document text
    • http://korporacjaroma.pl/images/free-roblox-acc_GM431946152.pdfIn PDF document text
    • http://korporacjaroma.pl/images/claim-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://korporacjaroma.pl/images/coin-master-free-spins-hack-but-no-surveys_GM406889139.pdfIn PDF document text
    • http://korporacjaroma.pl/images/how-to-get-free-followers-on-roblox_GM431946152.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_off00004906.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4906 25364 bytes
SHA-256: 69e91bb5b4bfce7c2da957480a5d79aeddef170bd8d985e6d312d5ccb64aad50
font_01_sfnt_off000082bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82BF 17884 bytes
SHA-256: 7b855ef2bb944b5b370c61480927ccad63ff31bdbf820bc1f0da9d35a10f5fb2

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