Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd08e3ad2d5fcf39…

MALICIOUS

PDF

44.0 KB Created: 2021-05-17 07:37:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 6a1e8d4b0b9f1808c1b1b59cf5a73255 SHA-1: 9e687294cf7456b51215eb4bd32c25d6fd64be6e SHA-256: dd08e3ad2d5fcf398fa7a89dfc7125c59f95c85331f40c55edc4092e8307638a
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, disguised as offers for free game currency or hacks. The document body and embedded links explicitly promote these lures, aiming to trick users into visiting malicious sites. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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/how-to-get-free-robux-games-game-hack In PDF document text
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/spin-free-coin-master_GM406889139.pdfIn PDF document text
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/free-pet-treats-coin-master_GM406889139.pdfIn PDF document text
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/minecraft-app-store-free_GM479516143.pdfIn PDF document text
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/download-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/free-online-generator-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/coin-master-free-spins-2021-hack_GM406889139.pdfIn PDF document text
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/toolbox-mod_GM479516143.pdfIn PDF document text
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/how-to-log-out-of-coin-master_GM406889139.pdfIn PDF document text
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/give-free-robux_GM431946152.pdfIn PDF document text
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/how-to-get-minecraft-for-free-on-xbox_GM479516143.pdfIn PDF document text
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/free-free-robux_GM431946152.pdfIn PDF document text
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/113-hacked-client_GM479516143.pdfIn PDF document text
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/robux-hack-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
font_00_sfnt_off00004b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4B13 26932 bytes
SHA-256: 4295d8bcdf5c28b7b521829beda9b5115b52de087a44212bae80a0d9fc6213bd
font_01_sfnt_off0000881b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x881B 18768 bytes
SHA-256: f0658a260a8345a08039bbf50682235c712e1d6bfd9b3eebd82ad720f29012b5

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