Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1ea5f9f5ee4df02…

MALICIOUS

PDF

36.0 KB Created: 2021-06-26 10:06:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 7f9bac8d93521d189e7a64b322f344c0 SHA-1: 7329dc828533bcf96bd277f8d4f1d84955e141f0 SHA-256: b1ea5f9f5ee4df0266f493cbff9f233668c9c1be129b4fb000f4420a3e217db2
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links designed to lure users into clicking on promises of free game items and hacks, ultimately directing them to a malicious redirector. The document body and heuristics indicate a link farm strategy, likely to drive traffic to potentially malicious sites or downloaders. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/best-free-outfits-on-roblox-game-hack In PDF document text
    • http://library.stikessuakainsan.ac.id/repository/create-minecraft-server-free_GM479516143.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/how-to-get-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/free-robux-no-gift-card_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/how-to-become-hacker-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/how-to-get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/noob-vs-pro-vs-hacker-vs-god-minecraft_GM479516143.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/hack-crack-for-coin-master-currency_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/free-robux-generator_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/coin-master-gold-cards-free_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/earn-free-robux-today_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/hack-xp-net-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/coin-master-free-soins_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/free-robux-no-download_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/how-to-get-infinite-robux_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/try-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/coin-master-free-spins-link-today-haktuts_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/free-op-minecraft-servers_GM479516143.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/hack-coin-master-game_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/free-robux-site-fracais-fiable_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/how-to-have-free-robux-with-site_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
font_00_sfnt_off00003427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3427 23080 bytes
SHA-256: cb3a3f11b8953b8d4c4b538d68048408a51d4715ebe00e2f7e0b2692472ff0c0
font_01_sfnt_off000067dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67DD 19012 bytes
SHA-256: 53f740cbea9c49fd5d54177788cd697b484a96442b3f32b7f87a340c92f9cc5d

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