Malicious PDF — malware analysis report

Static analysis result for SHA-256 38b275619149b591…

MALICIOUS

PDF

55.4 KB Created: 2021-05-11 23:35:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 0eabf3b597a46e8961e73a5f72abf383 SHA-1: 33618dd2ca57e19f209fd238cf5b229f8ac14b9d SHA-256: 38b275619149b5915d0f2adb76e76b917b9ae48857ce260ddb2ba3ef4135cbda
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'game hacks' and 'free currency'. The ML classifier strongly indicated maliciousness, and the presence of numerous links to known redirectors confirms a lure-based attack pattern. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a phishing or scam attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9515

Heuristics 4

  • 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.
  • 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/431946152/roblox-hack-generator-game-hack In PDF document text
    • http://perpus.stfm.ac.id/repository/coin-master-free-spins-2021-app-download_GM406889139.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/coin-master-free-spins-link-quora_GM406889139.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/free-spins-on-coin-master-link_GM406889139.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/how-to-hack-peoples-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/reddit-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/easy-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/i-want-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/how-to-get-free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/free-robux-codes-no-human-verification_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/download-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/free-mods-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/robux-xyz_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/how-to-hack-coin-master-ios-2021_GM406889139.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/free-coin-master-spins-daily_GM406889139.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/robuxmatch-com-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/coin-master-heaven-links_GM406889139.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/rbxfree-com-free-robux_GM431946152.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b99.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B99 36096 bytes
SHA-256: 365542c576831d42381aab847e1dea5b9f226b07cd2e5777bcb4d6f2971f25cb
font_01_sfnt_off00009a05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A05 8756 bytes
SHA-256: 885cc3dcd3b3bf25a7071b83cd9400027ebc172c0fa24e2a2e5e827eb94c129b
font_02_sfnt_off0000b69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB69D 18284 bytes
SHA-256: 25a7dda4fa93a15709e62d61065895c31c9e65ce27a7c8bbaa34224db667a0ef

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