Malicious PDF — malware analysis report

Static analysis result for SHA-256 11b78df795a6ba96…

MALICIOUS

PDF

46.3 KB Created: 2020-08-07 05:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d47c4c4546583060a633263924b9297 SHA-1: 504436a51b204cda8cae91ed88290aa8c3c0a991 SHA-256: 11b78df795a6ba967a8e161e85c5b54482f44bd64807cb727abacebfe3631b51
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains a large number of embedded links, many of which point to a redirector infrastructure. The document body text, though obfuscated, includes the URL 'https://ttraff.com/pify?keyword=emotions+worksheet+for+adults+pdf', suggesting a lure to a malicious site. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm indicates an attempt to manipulate search engine results or distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://ttraff.com/pify?keyword=emotions+worksheet+for+adults+pdf
    • http://files.taiwan-autoshade.com/uploads/1/3/0/7/130738603/nulak.pdf
    • http://files.mymoonmalas.com/uploads/1/3/1/1/131163705/7543be23a2ad8de.pdf
    • http://files.mixelle91.com/uploads/1/3/2/7/132710661/panogiro_nalokoripo_nusume.pdf
    • http://files.woodlawnbaptistchurchjohnsonfl.com/uploads/1/3/1/6/131607544/9122783.pdf
    • http://files.griswoldart.org/uploads/1/3/1/8/131856285/2713342.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/9513/7181/files/diehard_battery_charger_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/2338/5247/files/rumafumox.pdf
    • https://cdn.shopify.com/s/files/1/0429/9200/9365/files/descargar_agenda_2020_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0435/0047/0438/files/yasin_tahlil_latin.pdf
    • https://cdn.shopify.com/s/files/1/0454/8378/6392/files/definicion_de_bactericida_y_bacteriostatico.pdf
    • https://cdn.shopify.com/s/files/1/0434/6858/7174/files/boxing_training_at_home_workouts.pdf
    • https://cdn.shopify.com/s/files/1/0431/1249/7312/files/63589530385.pdf
    • https://cdn.shopify.com/s/files/1/0437/0428/7383/files/74317087528.pdf
    • https://cdn.shopify.com/s/files/1/0451/3228/4057/files/monthly_calendar_2020_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/7469/8912/files/atletismo_pruebas_de_pista.pdf
    • https://cdn.shopify.com/s/files/1/0432/1184/9890/files/legiguvukidekopuradojes.pdf
    • https://cdn.shopify.com/s/files/1/0435/9038/5821/files/xokim.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007131.bin
b97d5511aaa19f0ac5129f3ac99de9fbb275f77d7432f1d55830758fcfa513ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7131 5392 bytes
font_01_sfnt_off00008372.bin
765362821efd665032e9f12415ae29cd4d218646cf84e0ba641adff295adb46e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8372 12708 bytes

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