Malicious PDF — malware analysis report

Static analysis result for SHA-256 643a18cf3a65cd01…

MALICIOUS

PDF

44.5 KB Created: 2021-05-15 14:04:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-14
MD5: bfedff0a505924c1786c530f0bc88245 SHA-1: a6f1eb4e48cd19971d6cdb00bb4cdf90c90520f9 SHA-256: 643a18cf3a65cd018a0b6fb057ec9832d98861c1818126aeecd1f213f3d1a28a
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 a "free generator / game hack". The presence of these links and the ML classifier's high confidence score indicate a malicious intent to lure users to potentially harmful sites. Although no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a social engineering tactic to compromise users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/free-2021-robux-game-hack In PDF document text
    • http://elearning.mtsn8kuningan.sch.id/__statics/gudangsoal/files/coin-master-free-link-daily_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn8kuningan.sch.id/__statics/gudangsoal/files/free-robux-giveaway-live_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn8kuningan.sch.id/__statics/gudangsoal/files/roblox40com-robux_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn8kuningan.sch.id/__statics/gudangsoal/files/how-to-hack-coins-in-mcpe-master_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn8kuningan.sch.id/__statics/gudangsoal/files/how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn8kuningan.sch.id/__statics/gudangsoal/files/robux-free-2021_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn8kuningan.sch.id/__statics/gudangsoal/files/apps-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn8kuningan.sch.id/__statics/gudangsoal/files/bux-gg-robux-free_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn8kuningan.sch.id/__statics/gudangsoal/files/free-minecraft-resource-packs_GM479516143.pdfIn PDF document text
    • http://elearning.mtsn8kuningan.sch.id/__statics/gudangsoal/files/minecraft-win-10-free_GM479516143.pdfIn PDF document text
    • http://elearning.mtsn8kuningan.sch.id/__statics/gudangsoal/files/2021-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn8kuningan.sch.id/__statics/gudangsoal/files/roblox-hack-ga_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn8kuningan.sch.id/__statics/gudangsoal/files/minecraft-story-mode-free_GM479516143.pdfIn PDF document text
    • http://elearning.mtsn8kuningan.sch.id/__statics/gudangsoal/files/blox-supply-free-robux_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn8kuningan.sch.id/__statics/gudangsoal/files/how-to-get-minecraft-pe-for-free-ios_GM479516143.pdfIn PDF document text
    • http://elearning.mtsn8kuningan.sch.id/__statics/gudangsoal/files/generator-robux_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn8kuningan.sch.id/__statics/gudangsoal/files/coin-master-attack-hack-apk_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn8kuningan.sch.id/__statics/gudangsoal/files/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn8kuningan.sch.id/__statics/gudangsoal/files/2021-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn8kuningan.sch.id/__statics/gudangsoal/files/coin-master-hack-no-download_GM406889139.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_003_off00004cd2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CD2 26616 bytes
SHA-256: 90c347f53e12b55e378250b9382b24dbcacd46ecd63f118c42b8972f835cd886
font_01_sfnt_off00008b5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B5F 18416 bytes
SHA-256: 24dd33113ad1920a4b79572916f2875f9d05bd64d95cc44e0cd438e20c1ad4df

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