Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e49779f393b59c2…

MALICIOUS

PDF

34.8 KB Created: 2021-07-08 06:25:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 98c5bff0020237a711226f9bdb5b0cf4 SHA-1: 33fdd6977a19090f1d0c3d153e154f79cfdc835b SHA-256: 4e49779f393b59c24a90a43c17dced29df05b3cf7a23313ffc78330ca7f6f232
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to malicious redirectors and SEO link farms, designed to lure users into downloading further malicious content. The primary lure is related to game hacks and free currency, indicating a social engineering tactic. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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 http://netcdn.tw/app/406889139/free-coins-coin-master-2021-game-hack In PDF document text
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/how-to-hack-any-roblox-account_GM431946152.pdfIn PDF document text
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/minecraft-pe-free-download-ios_GM479516143.pdfIn PDF document text
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/is-coin-master-hack-safe_GM406889139.pdfIn PDF document text
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/hacks-robloxco_GM431946152.pdfIn PDF document text
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/freerubux_GM431946152.pdfIn PDF document text
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/free-robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/is-there-any-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/roblox-hack-app_GM431946152.pdfIn PDF document text
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/getrobux-ninja_GM431946152.pdfIn PDF document text
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/free-robux-december-2021_GM431946152.pdfIn PDF document text
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-today-new_GM406889139.pdfIn PDF document text
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/app-store-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/free-gift-card-ins-roblox_GM431946152.pdfIn PDF document text
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/coin-master-heaven-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/coin-master-free-spins-today-39_GM406889139.pdfIn PDF document text
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/real-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/webs-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000301d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x301D 23392 bytes
SHA-256: ff3a90f9fd37c8cc7dd9424263f4e5853950e199fe9bc2f8e917fb9e2b243c5f
font_01_sfnt_off000064fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64FC 18400 bytes
SHA-256: 2a3e6040a3b782e95a9624477cdba266f2d22bc61ba2df799c05fa910d77e25c

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