Malicious PDF — malware analysis report

Static analysis result for SHA-256 28f4ef641b419274…

MALICIOUS

PDF

47.4 KB Created: 2021-05-13 15:33:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5b5c9626eecb6ce743fa2bf4cee4019a SHA-1: a20b086e97cb6e9a3acc66448c18813dae3c17a2 SHA-256: 28f4ef641b419274337038d8d1c254320545316ced50cd56aad8fc926991af81
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and a link farm, suggesting a phishing or malware distribution attempt. The document body and heuristics indicate a lure for 'free generators' and 'game hacks', which is a common social engineering tactic. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a malicious workflow, likely involving redirection to exploit kits or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

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.
  • 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.
  • 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/easy-robux-generator-game-hack In PDF document text
    • http://leagueforwomenrights.gr/images/how-to-get-free-skins-in-minecraft_GM479516143.pdfIn PDF document text
    • http://leagueforwomenrights.gr/images/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://leagueforwomenrights.gr/images/coin-master-card-collection-hack_GM406889139.pdfIn PDF document text
    • http://leagueforwomenrights.gr/images/minecraft-free-download-mac-full-version-2021_GM479516143.pdfIn PDF document text
    • http://leagueforwomenrights.gr/images/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://leagueforwomenrights.gr/images/coin-master-free-coins-link-facebook_GM406889139.pdfIn PDF document text
    • http://leagueforwomenrights.gr/images/coin-master-blogspot_GM406889139.pdfIn PDF document text
    • http://leagueforwomenrights.gr/images/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • http://leagueforwomenrights.gr/images/coin-master-hack-apk-free-download_GM406889139.pdfIn PDF document text
    • http://leagueforwomenrights.gr/images/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
    • http://leagueforwomenrights.gr/images/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://leagueforwomenrights.gr/images/www-rbx-com_GM431946152.pdfIn PDF document text
    • http://leagueforwomenrights.gr/images/2021-roblox_GM431946152.pdfIn PDF document text
    • http://leagueforwomenrights.gr/images/minecraft-hacks-18-9_GM479516143.pdfIn PDF document text
    • http://leagueforwomenrights.gr/images/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • http://leagueforwomenrights.gr/images/free-minecraft-java-edition-codes_GM479516143.pdfIn PDF document text
    • http://leagueforwomenrights.gr/images/coin-master-hacks-2021_GM406889139.pdfIn PDF document text
    • http://leagueforwomenrights.gr/images/free-spins-coin-master-ios-2021_GM406889139.pdfIn PDF document text
    • http://leagueforwomenrights.gr/images/coin-master-free-generator_GM406889139.pdfIn PDF document text
    • http://leagueforwomenrights.gr/images/how-to-get-free-robux-as-a-kid_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_003_off00004826.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4826 27564 bytes
SHA-256: 198d207a547300572766a25e0fa6f2719ff788d8d9a910a2d9c41593cf67bbbb
font_01_sfnt_off0000893d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x893D 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off0000964e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x964E 18360 bytes
SHA-256: 31f26fbfc7f81002b444b70a1657336c723b940a34509e70260c3e3e292c9165

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