Malicious PDF — malware analysis report

Static analysis result for SHA-256 813c3ca35b6c68c1…

MALICIOUS

PDF

49.9 KB Created: 2021-06-03 22:03:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 1b452a963085f52ca33f37961fb8bb06 SHA-1: 00dfed02741ed546be3d0669b96674e9cf46a720 SHA-256: 813c3ca35b6c68c199cc4e7fbe8a9fcaed5349c7137a5ec0953cb93e6f65c05a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it's a malicious redirector lure, specifically advertising free game hacks and generators. The embedded URL, https://netcdn.online/app/479516143/try-minecraft-free-game-hack, is flagged as malicious and part of a redirector chain. The document body, though heavily obfuscated, contains references to this URL and the lure content, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.online/app/479516143/try-minecraft-free-game-hack In PDF document text
    • https://elearning.mtsguppicileungsir.sch.id/__statics/gudangsoal/files/hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtsguppicileungsir.sch.id/__statics/gudangsoal/files/coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • https://elearning.mtsguppicileungsir.sch.id/__statics/gudangsoal/files/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtsguppicileungsir.sch.id/__statics/gudangsoal/files/free-vpn-for-minecraft_GM479516143.pdfIn PDF document text
    • https://elearning.mtsguppicileungsir.sch.id/__statics/gudangsoal/files/free-robux-codes-2021-real_GM431946152.pdfIn PDF document text
    • https://elearning.mtsguppicileungsir.sch.id/__statics/gudangsoal/files/coin-master-hack-generator_GM406889139.pdfIn PDF document text
    • https://elearning.mtsguppicileungsir.sch.id/__statics/gudangsoal/files/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://elearning.mtsguppicileungsir.sch.id/__statics/gudangsoal/files/pubg-uc-with-easypaisa_GM1330123889.pdfIn PDF document text
    • https://elearning.mtsguppicileungsir.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://elearning.mtsguppicileungsir.sch.id/__statics/gudangsoal/files/moonactive-free-spins-link_GM406889139.pdfIn PDF document text
    • https://elearning.mtsguppicileungsir.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • https://elearning.mtsguppicileungsir.sch.id/__statics/gudangsoal/files/how-can-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://elearning.mtsguppicileungsir.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://elearning.mtsguppicileungsir.sch.id/__statics/gudangsoal/files/free-spin-and-win-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtsguppicileungsir.sch.id/__statics/gudangsoal/files/coin-master-free-spin-and-coin-link-haktuts-hacking-news_GM406889139.pdfIn PDF document text
    • https://elearning.mtsguppicileungsir.sch.id/__statics/gudangsoal/files/pubg-uc-qiymeti_GM1330123889.pdfIn PDF document text
    • https://elearning.mtsguppicileungsir.sch.id/__statics/gudangsoal/files/coin-master-hack-blog_GM406889139.pdfIn PDF document text
    • https://elearning.mtsguppicileungsir.sch.id/__statics/gudangsoal/files/gold-card-coin-master-free_GM406889139.pdfIn PDF document text
    • https://elearning.mtsguppicileungsir.sch.id/__statics/gudangsoal/files/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtsguppicileungsir.sch.id/__statics/gudangsoal/files/coin-master-free-spins-hack-link_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_004_off00005553.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5553 29560 bytes
SHA-256: 4ff1214e8849c76718d2a8d8535cd832b72741c988c2016e4b56a2c0f30e333a
font_01_sfnt_off00009868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9868 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off0000a21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA21A 17748 bytes
SHA-256: 107932d4c819bf12e68df3d86f91d46cdcad91a8442b853cf72bc94cc41b7ea1