Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a82a476e753be9b…

MALICIOUS

PDF

48.1 KB Created: 2021-06-03 12:13:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 104b993e3f2486621da2f0b39a07fe12 SHA-1: 4a566bd05eae0ce2b11a52caefef8df47d549d03 SHA-256: 1a82a476e753be9b44be08e34077974bcc47c4bac54391e89e602b90daa70d8e
280 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external websites, many of which are hosted on domains associated with link farms and malicious redirectors. The document body and heuristics indicate a lure for game-related cheats or currency, a common tactic for phishing or malware distribution. The presence of multiple PDF links suggests an attempt to broaden the attack surface by linking to other potentially malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 6

  • 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.
  • 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.online/app/406889139/free-coin-master-spins-blog-game-hack In PDF document text
    • http://perpustakaan.idia.ac.id/repository/free-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/free-minecraft-java-edition-account_GM479516143.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/appsmob-info-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/get-free-food-in-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/how-to-make-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/hack-my-game-xyz-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/free-roblox-hair-codes_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/free-spin-coin_GM406889139.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/apk-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/real-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/free-robux-for-kids-no-verification_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/free-tiktok-hearts_GM835599320.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/coin-master-free-spins-link-today-new_GM406889139.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/free-robux-thumbnail_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/coin-master-free-box_GM406889139.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/coin-master-hack-mod-apk-free-download_GM406889139.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/coin-master-free-spins-deutsch-download-ios-link_GM406889139.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/how-to-get-minecraft-realms-for-free_GM479516143.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/apps-to-get-free-robux_GM431946152.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_off000053ae.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53AE 25432 bytes
SHA-256: d392cbe50461713035e6f8faa63c862988fd1b0f1880907553e777f57d2b0e52
font_01_sfnt_off00008ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EC8 2868 bytes
SHA-256: 00109425b76763440a5569341faade0445b3c9f8514523a6f287fddbc9082efe
font_02_sfnt_off000098b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x98B5 18464 bytes
SHA-256: a2c76306a813766f02d16bba13a6176cc917de49c90529db8e6e2ffa1e8149db

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