Malicious PDF — malware analysis report

Static analysis result for SHA-256 beff2b1354e4236d…

MALICIOUS

PDF

33.6 KB Created: 2021-07-06 00:36:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: dff9b6e9bbce20c92e63a1cb3b2c4e89 SHA-1: a76121f245fec287952d6a0caac4f9a2a799dde3 SHA-256: beff2b1354e4236dd28b61eba4f12e053eac4ccd41d2d9c1dc8fc6666811631b
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs that are part of a link farm, designed to lure users with promises of free in-game items and currency. The ML classifier strongly indicated maliciousness, and the presence of external links suggests a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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.tw/app/406889139/free-coin-master-credit-game-hack PDF link annotation
    • http://library.apsidoarjo.ac.id/repository/pokemon-go-free-avatar-items_GM1094591345.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/free-private-server-roblox-strucid_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/roblox-free-robux-simulator_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/a-old-roblox-account-free_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id//repository/promo-code-free-robux_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/free-robux-give-away-everyone-will-get-robux-proof_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/free-robux-without-survey_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id//repository/free-coin-master-spins-and-coins-for-daily_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/roblox-mint-tycoon-money-hack_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/free-remy-roblox-id_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/roblox-frisk-shirt-free_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/how-to-get-gold-cards-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id//repository/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id//repository/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/cheat-codes-for-roblox-skywar-words_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/earn-free-robux-gg_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/hack-1k-robux_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/how-to-get-free-shields-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/minecraft-bedrock-edition-download-pc-free_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
font_00_sfnt_off00002f66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F66 22316 bytes
SHA-256: c88e6278a4ad8ed39b8e74a22950e9b1e321098d3fe24f69ed47963e05e8b02a
font_01_sfnt_off000060e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60E2 18172 bytes
SHA-256: 2fc47c4066dd28e3547f22ef08ec611cc49326c2517731f27ce49f34897b6455

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