Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdb665a7b0983971…

MALICIOUS

PDF

45.2 KB Created: 2021-06-10 23:00:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5de774608d3fcc351259dc5d00f21a88 SHA-1: 1e34e4849aa8cf107ea8486ab5c2b53f17bb170a SHA-256: cdb665a7b0983971a5f005b820213b55d758d148f4fc692b6b908ab172c2d5fd
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple links to websites offering game hacks and cheats, including a primary link to a known malicious redirector. The document body and heuristics indicate a lure for users seeking in-game advantages, likely leading to further malicious content or downloads. The presence of numerous SEO-optimized PDF links suggests an attempt to distribute this lure widely.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.tw/app/431946152/roblox-geld-cheaten-game-hack In PDF document text
    • http://stikespantirapih.ac.id/home/repository/coin-master-mod-apk-latest-hack-with-unlimited-free-spins_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/what-is-a-robux_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/download-hacked-games-coin-master_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/coin-master-hack-2021-no-survey_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-spin-link-for-coin-master-haktuts_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/coin-master-hack-mod-apk-35-8_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-hack-mad-city-roblox_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-account-roblox-with-robux_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/minecraft-free-download-ios_GM479516143.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-robux-sites-that-work_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-minecraft-skin-packs_GM479516143.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-robux-survey_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/descargar-roblox-hackeado-2021-ultima-version_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/pubg-uc-transfer_GM1330123889.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/pokemon-go-free-rare-candy_GM1094591345.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/easy-robux_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/best-site-for-free-coin-master_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/hack-para-robux-real_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-get-any-roblox-item-free_GM431946152.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_004_off0000521d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x521D 25420 bytes
SHA-256: 66afc47579aa717bfb646430b3d507e86dd1c1c234d8c940258ba5b3f2260726
font_01_sfnt_off00008d47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D47 18456 bytes
SHA-256: aebac2b07f38ff0c40db750feeef8db55235de40a5d8ab5df0b249945f9d2c6b

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