Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6600993d7894817…

MALICIOUS

PDF

41.3 KB Created: 2021-05-10 15:01:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 8d9f034856e1bf7fe4e776abfbdb4f72 SHA-1: 0db964f89635e1fd97b9d2e2d7004f7e56d8b4bb SHA-256: b6600993d7894817e89ba3112b54a32bc0701535b9e372e3d6010057b6493bca
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector infrastructure, specifically advertising 'free generator / game hack' lures. One critical heuristic identified a direct link to a known malicious redirector. The document body, though partially corrupted, contains similar lure text and a URL that aligns with the observed malicious redirection pattern. No scripts were extracted, but the presence of malicious links and the lure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9826

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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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-spins-moonactive-game-hack In PDF document text
    • http://unionmusicaldebenidorm.com/images/coin-master-spin-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://unionmusicaldebenidorm.com/images/coin-master_GM406889139.pdfIn PDF document text
    • http://unionmusicaldebenidorm.com/images/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://unionmusicaldebenidorm.com/images/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
    • http://unionmusicaldebenidorm.com/images/coin-master-free-spins-and-coins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://unionmusicaldebenidorm.com/images/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://unionmusicaldebenidorm.com/images/minecraft-18-9-hacked-client_GM479516143.pdfIn PDF document text
    • http://unionmusicaldebenidorm.com/images/how-to-get-minecraft-dungeons-for-free_GM479516143.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_off00003ca3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3CA3 25272 bytes
SHA-256: e6bbafe4ecba7521f78b57fdbb79103aea15acb5903e5fd123c94ec6447f72d1
font_01_sfnt_off00007641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7641 2944 bytes
SHA-256: fcfcd28869b8d6c7503d63ed8d48371ec5b580fea2733193e2acbb82b3d30a76
font_02_sfnt_off0000806c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x806C 18000 bytes
SHA-256: 6e064c38beceb31ff24ebe250b6be537090a6ec3e265cab0f175a96c42dfbe24

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