Malicious PDF — malware analysis report

Static analysis result for SHA-256 990b820ea1d621f4…

MALICIOUS

PDF

42.2 KB Created: 2021-05-11 02:34:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 5138b47dfc44360bc36b5d2d48aa17c3 SHA-1: 5596e6b831b016e7984f9f64f7421b569b290b45 SHA-256: 990b820ea1d621f4b07050363245bd1d34613839df4bb73a9d9737d12cc2a2fc
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure related to game hacks and free resources to entice users into clicking embedded links. The primary link directs to a known malicious redirector, which likely serves as a gateway to further malicious content or downloads. The presence of multiple similar links reinforces the malicious intent of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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-free-spin-and-coins-links-game-hack In PDF document text
    • http://perpus.polbitrada.ac.id/repository/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/blox-supply-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/is-minecraft-free-on-pc_GM479516143.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/free-minecraft-capes-no-mods_GM479516143.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/free-robux-generator-no-human-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/coin-master-hack-twitter_GM406889139.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/coin-master-free-stuff_GM406889139.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/coin-master-free-link_GM406889139.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/giftrobux-com-generator_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/how-to-use-redstone_GM479516143.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/what-is-exploiting-in-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/coin-free-spin_GM406889139.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/free-roblox-scripts_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/roblox-g_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/coin-master-free-spins-and-coins-group_GM406889139.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/coin-master-free-spin-and-coins-links-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_003_off00004b3b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B3B 24464 bytes
SHA-256: 99b9a9030cf20ffcb30e26d3fa48e0d6c1c85a80bf389612a3f7b886c5a74dd0
font_01_sfnt_off000082c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82C3 18228 bytes
SHA-256: ab1c4cdc214a6baf81a15e2f62a40ea9cfbbbf407f0f3dd1c7564e467cf0dae2

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