Malicious PDF — malware analysis report

Static analysis result for SHA-256 381c5b29926bc623…

MALICIOUS

PDF

48.5 KB Created: 2021-05-10 22:42:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 14cdb19f3f3a65ad9feced395c05fa3a SHA-1: a3ecf10cb9eba85236c2b49e24b2464d34badb7b SHA-256: 381c5b29926bc6236defde68ee226e7f3a67f7dd60143218c5d0124006b0c004
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external sites, many of which are part of a link farm designed to lure users with promises of free game items or hacks. The primary redirector URL is associated with malicious activity, and the document body, though heavily obfuscated, contains references to game hacks and generators. This suggests the document's purpose is to drive traffic to malicious sites, likely for further exploitation or malware delivery.

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/how-to-make-clothes-on-roblox-for-free-game-hack In PDF document text
    • https://encounternepal.com/userfiles/files/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/minecraft-hacked-client-18_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/daily-spin-coin-master-free_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/omplete-surveys-for-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-free-spin-app-iphone_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-spin-coin-master-app-download_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-spins-hack-2021_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-hack-mod-apk-unlimited-spin-download_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/hack-coin-master-apk-2021_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/minecraft-pe-free_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-hack-com_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/rbxcity-free-robux_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-spin-link-free_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/links-for-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/www-robux-com_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-watch-ads-for-free-spins-in-coin-master_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_off00004d79.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D79 27000 bytes
SHA-256: 6f013c13b8725146aca035f52947e8aa4a179951fb85ab9e0df01f89ad889d60
font_01_sfnt_off00008c10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C10 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9922 18976 bytes
SHA-256: b61b86c25d6115ff697aefd9ab641b9f071fd28e07f949dfa38bf6f9b5f40050

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