Malicious PDF — malware analysis report

Static analysis result for SHA-256 662df82ddb1c14d1…

MALICIOUS

PDF

47.8 KB Created: 2021-06-07 18:51:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5ba4538f7c2796e66fe9507c05217e36 SHA-1: e2822b575c7b48a921e19ab80ce99e282856914f SHA-256: 662df82ddb1c14d102f8e0ef91ff5dc1c74b7183c03a04bc86478a007f7ddcbf
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, masquerading as free game hacks or generators. The document body and heuristics indicate a lure to download or access potentially harmful content. No scripts were extracted, but the embedded URLs and redirector links are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.tw/app/431946152/free-roblox-injector-for-hacks-2021-game-hack In PDF document text
    • http://www.3d-gold.com.hk/upload/files/how-to-get-free-food-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/free-coin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/coin-master-70-spin-link-today_GM406889139.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/get-free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/how-to-change-username-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/coin-master-free-coins-and-spins-online-tool_GM406889139.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/free-robux-codes-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/how-to-get-minecraft-for-free-on-android-device_GM479516143.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/free-robux-with-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/free-robux-without-verify_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/minecraft-windows-10-free_GM479516143.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/hack-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/free-roblox-hack-us_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/como-hackear-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/free-robux-only-username_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/robux-win_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/haktuts-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/how-to-get-free-robux-easy_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_004_off0000545f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x545F 27752 bytes
SHA-256: 1e9c0b6bad3ecc00b9c61a42008e21e022799f3d567ec00521360c82c43dac39
font_01_sfnt_off000095d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95D5 19040 bytes
SHA-256: 8a38621c0cd8854f23625e5b1baa7e96d16236dab3b895744831c5c2143ad1be

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