Malicious PDF — malware analysis report

Static analysis result for SHA-256 c128b69b7f8453e1…

MALICIOUS

PDF

43.3 KB Created: 2021-05-12 07:12:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: c9deaba6b5c86069629f47b1f51c21e5 SHA-1: 31a99d3f27d9f2414e79de92e95a481137232dc1 SHA-256: c128b69b7f8453e15dcb1461782a344eb01c98aaa81321ebc90f5fb03f19ba6a
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are SEO-optimized PDF documents related to game hacks and free currency generators. One primary URL, 'https://netcdn.xyz/app/431946152/roblox-free-clothes-codes-game-hack', is identified as a malicious redirector. The document's content and structure strongly suggest a lure to trick users into visiting these sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/roblox-free-clothes-codes-game-hack In PDF document text
    • http://repository.ummy.ac.id//repository/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-apk-free-download_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/how-do-you-hack-for-2021000-coins-on-flip-master_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-hack-spin-link_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/hack-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/roblox-inappropriate-games_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/my-minecraft-account-was-hacked_GM479516143.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/how-to-get-free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/how-to-create-group-in-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-free-spins-link-may-2021_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/minecraft-116-apk-download_GM479516143.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/funbloxxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/cm-daily-spins_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/minecraft-launcher-free_GM479516143.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-roblox-money_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-robux-without-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-hack-link_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-minecraft-account_GM479516143.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_off000048e7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48E7 26224 bytes
SHA-256: f6791eb8e149cc4665559d340b999d53e9bda311a3a52153e61d96c4880fd7e1
font_01_sfnt_off000086bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86BD 18392 bytes
SHA-256: d8b17fa3f29c5fc3b2ca0cecc93d61ab3a50b68dc1f93f0739daeae1c5528549

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