Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f074379a8a5d43b…

MALICIOUS

PDF

45.1 KB Created: 2021-05-12 19:37:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 8e0698931c84543171a57e95566a82fa SHA-1: 84dd4fd48889feb168803004c9529e0784928a65 SHA-256: 9f074379a8a5d43ba23dcf9670e697548c5e1b48ddc3e53bdff8af0c60e49711
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links disguised as game hacks and free currency generators, which are common lures for phishing or malware distribution. One critical heuristic identified a malicious redirector link, and another pointed to an IP address, indicating a likely attempt to direct users to malicious infrastructure. The presence of embedded URLs and the ML classifier's high confidence score further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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.xyz/app/406889139/coin-master-free-coins-link-march-2021-game-hack In PDF document text
    • http://103.30.145.97/__statics/gudangsoal/files/coin-master-coins-free_GM406889139.pdfPDF link annotation
    • http://103.30.145.97/__statics/gudangsoal/files/get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://103.30.145.97/__statics/gudangsoal/files/oprewards-com-earn_GM431946152.pdfIn PDF document text
    • http://103.30.145.97/__statics/gudangsoal/files/free-roblox-hack-us_GM431946152.pdfIn PDF document text
    • http://103.30.145.97/__statics/gudangsoal/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://103.30.145.97/__statics/gudangsoal/files/games-like-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://103.30.145.97/__statics/gudangsoal/files/how-to-get-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://103.30.145.97/__statics/gudangsoal/files/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://103.30.145.97/__statics/gudangsoal/files/free-spins-on-coin-masters_GM406889139.pdfIn PDF document text
    • http://103.30.145.97/__statics/gudangsoal/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://103.30.145.97/__statics/gudangsoal/files/free-robux-place_GM431946152.pdfIn PDF document text
    • http://103.30.145.97/__statics/gudangsoal/files/coin-master-hack-to-get-free-spins_GM406889139.pdfIn PDF document text
    • http://103.30.145.97/__statics/gudangsoal/files/how-to-hack-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://103.30.145.97/__statics/gudangsoal/files/free-spins-and-coins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://103.30.145.97/__statics/gudangsoal/files/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://103.30.145.97/__statics/gudangsoal/files/free-games-coin-master_GM406889139.pdfIn PDF document text
    • http://103.30.145.97/__statics/gudangsoal/files/free-roblox-clothes-2021_GM431946152.pdfIn PDF document text
    • http://103.30.145.97/__statics/gudangsoal/files/coin-master-free-spins-apk-2021_GM406889139.pdfIn PDF document text
    • http://103.30.145.97/__statics/gudangsoal/files/how-to-hack-roblox-accounts-for-robux_GM431946152.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_003_off000048a0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48A0 25248 bytes
SHA-256: fd542a299e24c71967a0bc0228167ac4f2ad481893f0520778efed185377f932
font_01_sfnt_off00008362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8362 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D14 18448 bytes
SHA-256: 53fc9b00e8334927a06c417505ef1231a561c67dc2332cbf65c5abe9a93c6d77

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