Malicious PDF — malware analysis report

Static analysis result for SHA-256 db5b52424a613adf…

MALICIOUS

PDF

45.6 KB Created: 2021-06-08 12:58:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: b5639a6fc23068fda0ed4ceb909e79c8 SHA-1: 6ff92d88846002a8cb312d51211984ee784353eb SHA-256: db5b52424a613adfbc8791c70a29ff93c4b25d989008fb8123d089005aa3fd04
200 Risk Score

Malware Insights

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

The PDF document contains lures for game-related cheats and free items, directing users to a malicious redirector. The document also contains instructions to disable security software, indicating a malicious intent to bypass defenses. The presence of embedded URLs and the ML classifier's high confidence score support the assessment of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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/quel-touche-faire-pour-avoir-le-free-code-dans-roblox-game-hack In PDF document text
    • http://zercalo.org/images/coin-master-free-spins-1-coin-master_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-group_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/robloxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-to-get-followers-on-tiktok-for-free_GM835599320.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-app_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/cheat-engine-roblox-this-game-has-shut-down_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/link-coin-master_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-heaven-links_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-coins-hack_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/get-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/pokemon-go-free-candy_GM1094591345.pdfIn PDF document text
    • http://zercalo.org/images/pubg-uc-cheap-price_GM1330123889.pdfIn PDF document text
    • http://zercalo.org/images/free-tiktok-likes-no-survey_GM835599320.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000052a1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52A1 25012 bytes
SHA-256: dbcd2dfe309d23f1c27a4a6db620ff56481daeb5f3e302808f24210216a07be8
font_01_sfnt_off00008cba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CBA 19372 bytes
SHA-256: 8d1dce5ab4cc276ee8a16d454ab4f64a4d6f9a0012a1d82c5602e06bce9b3d0e

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