Malicious PDF — malware analysis report

Static analysis result for SHA-256 faa6ff9ab0d24a39…

MALICIOUS

PDF

48.0 KB Created: 2021-06-03 12:57:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 84e67b1a244d5ea4935460c8fc3cd3f0 SHA-1: c91725c8c9a11f7e130b33fa283fff13e81e4657 SHA-256: faa6ff9ab0d24a39ad98092914107b1f47a90a4b814978a7c03e720d941cc48c
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, including a known malicious redirector. The document body and heuristics indicate a lure for 'game hacks' or 'free generators', suggesting a scam or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely to redirect users to phishing or exploit sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.online/app/431946152/robux-now-game-hack In PDF document text
    • http://librarysenior.com//repository/i-got-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/open-coin-master_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/free-minecraft-skins-pe_GM479516143.pdfIn PDF document text
    • http://librarysenior.com/repository/free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/free-robux-websites-that-work_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/minecraft-java-edition-code-free_GM479516143.pdfIn PDF document text
    • http://librarysenior.com//repository/free-minecraft-server-hosting-with-plugins_GM479516143.pdfIn PDF document text
    • http://librarysenior.com//repository/hack-master-coin_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/how-to-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/pokemon-go-free-coins-2021_GM1094591345.pdfIn PDF document text
    • http://librarysenior.com//repository/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://librarysenior.com/repository/can-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/hack-coin-master-without-verification_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/coin-master-free-spins-2021-no-human-verification_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/free-robux-generator-codes_GM431946152.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_004_off00005272.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5272 26184 bytes
SHA-256: d8a6fa9d02ad08fe6b7469c78a6794bcc18826af7940cc291f5c04c669599fb4
font_01_sfnt_off00008f82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F82 2940 bytes
SHA-256: ae8acc7f13e86db3aed98d7dfb73e70e16f4dedb45e9f0467460b76f54e1a1bb
font_02_sfnt_off00009991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9991 18012 bytes
SHA-256: 787059e27c97fd95fc6b9dfcfe7cdf2b2341ddc13028adf5c554515b3b1d6c26

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