Malicious PDF — malware analysis report

Static analysis result for SHA-256 e41d8bda65c90158…

MALICIOUS

PDF

44.7 KB Created: 2021-06-09 17:00:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 365db7e1114684ece9834b7ef24cc968 SHA-1: 7e83347dc30165b62e8708ea2fdda8629664a8dc SHA-256: e41d8bda65c901582821be00db69171c61cb7e70e4f81bb2ab61acbf4feb10d3
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to malicious redirectors and IP addresses, disguised as "free generator / game hack" lures. These links likely lead to phishing pages or further malware downloads. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs and a call-to-action button reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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/free-roblox-stuff-links-game-hack In PDF document text
    • http://110.232.83.89/slimsppks/repository/free-spins-coin-master-hack_GM406889139.pdfPDF link annotation
    • http://110.232.83.89/slimsppks/repository/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/coin-master-unlimited-spin-apk-free-download_GM406889139.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/free-modded-minecraft-server_GM479516143.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/free-robux-with-no-survey_GM431946152.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/free-robux-no-download_GM431946152.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/coin-master-hacks-xyz_GM406889139.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/how-can-you-get-robux_GM431946152.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/minecraft-java-server-hosting-free_GM479516143.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/how-to-make-free-robux_GM431946152.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/roblox-rape-hack_GM431946152.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/oprewards-free-robux_GM431946152.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/free-minecraft-survival-server_GM479516143.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/how-do-you-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/minecraft-games-free-to-play-online_GM479516143.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/minecraft-app-free-download_GM479516143.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/cheats-for-coin-master_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_004_off00005058.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5058 25724 bytes
SHA-256: a125658fbeb2fdc39cee9b0c02e3528ad667f695dca48a182787d9807ed361c6
font_01_sfnt_off00008b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B68 18480 bytes
SHA-256: cfc3a3a45eac399d9717e36edd76f52bbdf8783cc3b780df3b0024f9914533e4

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