Malicious PDF — malware analysis report

Static analysis result for SHA-256 1599cfe448aaa309…

MALICIOUS

PDF

45.2 KB Created: 2021-06-11 07:29:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 875f2b502871e19c4de4c327acf83eb0 SHA-1: 681966498e97d35c4dfa301f9357f7e4d687c538 SHA-256: 1599cfe448aaa309db3f3f09188f9a02c2b7adf2719d27d437476c2259a1a002
160 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirectors and sites offering game hacks and free in-game currency, indicating a lure-based attack. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the links suggests a potential for JavaScript execution or exploitation to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.tw/app/431946152/i-just-got-free-robux-game-hack In PDF document text
    • http://www.goaheadmigration.com/uploaded_files/userfiles/files/coin-master-free-spins-that-really_GM406889139.pdfIn PDF document text
    • http://www.goaheadmigration.com/uploaded_files/userfiles/files/how-to-get-free-robux-without-human-verification-on-ipad_GM431946152.pdfIn PDF document text
    • http://www.goaheadmigration.com/uploaded_files/userfiles/files/free-robux-scams_GM431946152.pdfIn PDF document text
    • http://www.goaheadmigration.com/uploaded_files/userfiles/files/how-to-get-a-free-remote-raid-pass_GM1094591345.pdfIn PDF document text
    • http://www.goaheadmigration.com/uploaded_files/userfiles/files/level-coin_GM406889139.pdfIn PDF document text
    • http://www.goaheadmigration.com/uploaded_files/userfiles/files/scripts-for-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://www.goaheadmigration.com/uploaded_files/userfiles/files/hack-xp-net-coin-master_GM406889139.pdfIn PDF document text
    • http://www.goaheadmigration.com/uploaded_files/userfiles/files/coin-master-hack-apk-2021_GM406889139.pdfIn PDF document text
    • http://www.goaheadmigration.com/uploaded_files/userfiles/files/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.goaheadmigration.com/uploaded_files/userfiles/files/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://www.goaheadmigration.com/uploaded_files/userfiles/files/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • http://www.goaheadmigration.com/uploaded_files/userfiles/files/roblox-cp_GM431946152.pdfIn PDF document text
    • http://www.goaheadmigration.com/uploaded_files/userfiles/files/download-minecraft-free-hiapphere_GM479516143.pdfIn PDF document text
    • http://www.goaheadmigration.com/uploaded_files/userfiles/files/free-robux-no-survey-or-human-verification_GM431946152.pdfIn PDF document text
    • http://www.goaheadmigration.com/uploaded_files/userfiles/files/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • http://www.goaheadmigration.com/uploaded_files/userfiles/files/coin-master-hack-game-download-ios_GM406889139.pdfIn PDF document text
    • http://www.goaheadmigration.com/uploaded_files/userfiles/files/how-do-you-hack-minecraft_GM479516143.pdfIn PDF document text
    • http://www.goaheadmigration.com/uploaded_files/userfiles/files/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
    • http://www.goaheadmigration.com/uploaded_files/userfiles/files/roblox-free-models_GM431946152.pdfIn PDF document text
    • http://www.goaheadmigration.com/uploaded_files/userfiles/files/real-free-robux-codes_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_004_off0000556f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x556F 24708 bytes
SHA-256: 2aee3a9fece2c6ff8a03342e15a680e9f87d90e93aaa1a1637f770b63b905dbf
font_01_sfnt_off00008e55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E55 18284 bytes
SHA-256: e5ddcf5bdc88df9d93c5a1800ae3b08e32198064ea382ed18b3c8c0a9965c573

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