Malicious PDF — malware analysis report

Static analysis result for SHA-256 28cc1857aff71f0b…

MALICIOUS

PDF

43.4 KB Created: 2021-06-03 23:49:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 938bd3604e65c9527f50de9677e444ab SHA-1: ac86ef9a616e1824c7cfea12c9583b8614bb0e2c SHA-256: 28cc1857aff71f0b2a78db57196dada52b946eab6db86a7c0f0e7722d06f012e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising game hacks and generators. The document body, though heavily obfuscated, contains a URL that aligns with the heuristic findings. The primary goal appears to be directing the user to malicious infrastructure that likely hosts further malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/406889139/coin-master-date-and-time-hack-game-hack In PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-free-spins-8-14-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/pubg-uc-new-freepik_GM1330123889.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/stock-speed-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/como-hackear-juego-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/free-private-server-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/roblox-hacking-website_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/free-minecraft-mods-for-pc_GM479516143.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/free-minecraft-resource-packs_GM479516143.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-free-spins-16-04-19_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/free-robux-group_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/gaming-dunia-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/free-spin-codes-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/free-minecraft-skin-creator_GM479516143.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/hack-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-root-hack_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/free-spin-links-coin-master-october-30-2021_GM406889139.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_off00004f0f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F0F 24332 bytes
SHA-256: 9a5339ab79c09df0a87985e578574295d78782ba4d6b5c7654bb47c275938a36
font_01_sfnt_off000086b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86B7 18316 bytes
SHA-256: 7bb22083c9314811711c29236537d9b39d24df6e47e77b9ae9fc3b3f4254db81

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