Malicious PDF — malware analysis report

Static analysis result for SHA-256 b97b617e4bfe228c…

MALICIOUS

PDF

42.2 KB Created: 2021-05-14 17:28:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3b57ba17621e9a9e74aa1ad8cc99550a SHA-1: 9bf30d9b749ee3dbd1fb18cfeea48c2a05594bfe SHA-256: b97b617e4bfe228cd17303fb0ec60ab2004d604bec9caa3f6b60c91cab80480a
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links designed to lure users to external sites, including a known malicious redirector. The document body and heuristics indicate a scam related to game hacks and free items, likely intended to lead users to further malicious content or phishing pages. The presence of numerous SEO-optimized PDF links suggests an attempt to distribute malicious content widely.

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/free-spins-coin-master-march-2021-game-hack In PDF document text
    • http://www.3d-gold.com.hk/upload/files/best-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/how-to-get-free-coins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/how-to-make-a-free-server-in-minecraft-java_GM479516143.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/how-to-hack-in-roblox-prison-life_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/minecraft-free-download-apk-softonic_GM479516143.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/coin-master-free-spins-2021-haktuts_GM406889139.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/how-to-make-roblox-clothes-for-free_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/coin-master-hack-tool-download_GM406889139.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/robux-generator-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/minecraft-hacker-skin_GM479516143.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/roblox-hack-scripts-pastebin_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/coin-master-how-to-get-free-pet-food_GM406889139.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/free-robux-codes-generator_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/boku-no-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/coin-master-free-spin-daily-bonus_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_off00004a0f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A0F 24640 bytes
SHA-256: 2c3079248a41586cf043ce49c2e56dcf89e65b4271ff29ec32028087dba3a7e2
font_01_sfnt_off00008238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8238 18452 bytes
SHA-256: f9f67c77da0d65153792dedd850da678f3a8682f9327ac55251990d25044da35

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