Malicious PDF — malware analysis report

Static analysis result for SHA-256 2120a2179f146be0…

MALICIOUS

PDF

35.8 KB Created: 2021-06-26 14:23:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5af469c8e7ef27098ac7c3916580b27e SHA-1: bde6d951f6c2114067668f49b0fd7162b7dc585d SHA-256: 2120a2179f146be0be6cb0dbfe63ae94565b648b37c8c62db8d3da0defebc1aa
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that lead to a malicious redirector, likely intended to deliver a second-stage payload. The document body and heuristics indicate a lure for free game items or hacks, a common social engineering tactic. The ML classifier strongly flags this PDF as malicious.

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 http://netcdn.co/app/431946152/free-robux-finish-obby-no-password-game-hack In PDF document text
    • https://mbbs.hr/files/robux-survey_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/free-minecraft-accounts-reddit_GM479516143.pdfIn PDF document text
    • http://mbbs.hr/files/pubg-uc-event_GM1330123889.pdfIn PDF document text
    • https://mbbs.hr/files/free-coin-master-hacks-no-verification-or-survey_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-free-spins-2-5-2021_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-hack-spins-and-coins-unlimited-free-download_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/freespinandcoin-blogspot-coin-master_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/hack-coin-master-ios-download_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/how-to-hack-minecraft_GM479516143.pdfIn PDF document text
    • https://mbbs.hr/files/will-minecraft-ever-be-free_GM479516143.pdfIn PDF document text
    • http://mbbs.hr/files/robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-spin-hack-2021_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/op-rewards-free-robux_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/how-to-hack-any-roblox-account-using-windows-command-prompt_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/minecraft-hacks-18-9_GM479516143.pdfIn PDF document text
    • http://mbbs.hr/files/free-robux-computer-hack_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
font_00_sfnt_off00003335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3335 22512 bytes
SHA-256: 748a5fe5dc9400501da652e2111ea7395ab1ccf58354a284dd751b9bf9b8ba7c
font_01_sfnt_off0000655b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x655B 19676 bytes
SHA-256: 1cdabe52f7097286af8caad00af2f7cc5a095de8bf844b3aaa07875d89c15e6c

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