Malicious PDF — malware analysis report

Static analysis result for SHA-256 52a1820b7f255592…

MALICIOUS

PDF

45.0 KB Created: 2021-05-11 02:51:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 18baaca0fa295e640f7bcd53b1285c40 SHA-1: 2d0e157f37e3747fb7791c9602c41dbd26420470 SHA-256: 52a1820b7f255592ea833c873e928074f531bd58aa1d5071e0ce3ed47349e93d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to malicious infrastructure, specifically promoting 'game hacks' and 'free spins' as a lure. The ML classifier also flagged this PDF as malicious. While no scripts were directly extracted, the embedded URLs and the nature of the lure strongly suggest a phishing or scam attempt, likely leading to further malware download or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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.xyz/app/406889139/coin-master-instagram-free-spins-game-hack In PDF document text
    • https://opac.umrah.ac.id/repository/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-coin-app_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/master-coin-free-spin_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-free-robux_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/get-free-robux_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/how-to-downgrade-minecraft-pe_GM479516143.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-robux-codes_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/minecraft-marketplace-free_GM479516143.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/minecraft-hack-mod_GM479516143.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/roblox-free-robux_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/how-to-hack-someone-on-roblox_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-free-spins-whatsapp-link_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-hack-2021-link_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-free-link_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/who-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-free-spins-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_003_off000048e4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48E4 25468 bytes
SHA-256: da6c556c973fb716ea28b299e991e20e809bf9b75265b208ea15acb23b997450
font_01_sfnt_off000082d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82D9 2920 bytes
SHA-256: 03f8397bdf627aa5eb6acb233d3c5d547fa213245667a48a7f92829839117302
font_02_sfnt_off00008cf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CF0 18432 bytes
SHA-256: dd21024a3a9b07f357a6a0b8e17fafd6007ea37835f944b4d5a0c49956a5fb59

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