Malicious PDF — malware analysis report

Static analysis result for SHA-256 99b0e0c7f4821ca6…

MALICIOUS

PDF

39.3 KB Created: 2021-05-25 07:30:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: a7484e2630eb56fa8b4f07fa419a1dd9 SHA-1: 34a56e1c9d45cd7bb831ab4d9f0d69f3c30bdf27 SHA-256: 99b0e0c7f4821ca6c390dcdf34a2e67561bf767cd89a96248196c478485f0e63
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple links to known malicious redirectors and impersonates Facebook to lure users with promises of game hacks. The document body and heuristics indicate a credential phishing or malware download attempt. No scripts were extracted, but the embedded links are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8060

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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/406889139/how-to-hack-coin-master-game-hack.
  • 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/how-to-hack-coin-master-game-hack In PDF document text
    • http://ltdirect.co.uk/images/coin-master-download_GM406889139.pdfIn PDF document text
    • http://ltdirect.co.uk/images/info-roblox-com-robux_GM431946152.pdfIn PDF document text
    • http://ltdirect.co.uk/images/minecraft-games-free-to-play-online_GM479516143.pdfIn PDF document text
    • http://ltdirect.co.uk/images/coin-master-guide-to-free-spins-and-rewards_GM406889139.pdfIn PDF document text
    • http://ltdirect.co.uk/images/coin-master-free-fire_GM406889139.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_002_off00003420.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3420 25364 bytes
SHA-256: d856932831c516b3af39c036cb9891e0fe76ad41ff2c38361d69ff0a81f4af6b
font_01_sfnt_off00006d77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D77 3560 bytes
SHA-256: 7adf3ecb2acc78bd8357c076bbb63f29c6bbfa21040d6a8d32266072fd69d550
font_02_sfnt_off00007953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7953 17880 bytes
SHA-256: 811ddb8557bc0f5be85009fa6d5ae0baa2b7fc09c58d91c5790597872cecd122

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