Malicious PDF — malware analysis report

Static analysis result for SHA-256 b78b54f4c8351d87…

MALICIOUS

PDF

49.2 KB Created: 2021-06-04 02:16:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 05b81ab9fa611fffc24392fc23423105 SHA-1: b2bfd762fced2b06c4c8d14615f905d48743621b SHA-256: b78b54f4c8351d8720ede14426228d69f89764897706c34ecc022977fec6e4b8
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links designed to lure users into clicking on what appear to be game-related generators or hacks. These links redirect to known malicious infrastructure, indicating a phishing or scam attempt. The document body and embedded links strongly suggest a social engineering pretext to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.online/app/431946152/free-robux-generator-2021-game-hack In PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/how-to-get-roebucks-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-free-spins-link-today-twitter_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-roblox-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/daily-free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/minecraft-redeem-code-free_GM479516143.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-free-spins-hack-download_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/pokemon-go-free-zone_GM1094591345.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/games-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-hack-pc-cheat-engine_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-robux-codes-generator_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/roblox-hack-game_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-hack-link-2021_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/haktuts-2021-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.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_off000051b0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51B0 27452 bytes
SHA-256: 3c7a5f326b91c7677fa52b20480f49766b2338a2d1bbc20242a1a716ebfb7df3
font_01_sfnt_off00008f26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F26 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C38 18748 bytes
SHA-256: fca1806ffff7593a0a2d811b077fe14576afb362c0c2e8ffc695fbf8edc3964d

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