Malicious PDF — malware analysis report

Static analysis result for SHA-256 88eb27171f9c8f8b…

MALICIOUS

PDF

48.9 KB Created: 2020-08-07 08:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6d39d5a162d583dcbe0d5334af80b5a1 SHA-1: 5e4dcbd343fd45251d99c7db1397d6db03fa43ab SHA-256: 88eb27171f9c8f8b128d31f83d2d9b84b4b5b962747d6c44f325f74273c14d21
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one prominent link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to a 'Canon rebel t3i user manual pdf' and the authoring application 'wkhtmltopdf', suggesting a lure to disguise malicious content. The presence of a link farm heuristic further indicates an attempt to manipulate search engine results or distribute malicious links.

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=canon+rebel+t3i+user+manual+pdf
    • http://files.arteology.us/uploads/1/3/1/4/131437222/sexakiripez-voweb-tejuroxisonom.pdf
    • http://files.richardellishair.co.uk/uploads/1/3/1/4/131437513/9046421.pdf
    • http://files.growersmarket.org/uploads/1/3/1/0/131070450/feruwabovaz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/9949/4302/files/97478514160.pdf
    • https://cdn.shopify.com/s/files/1/0430/7487/9641/files/17382703344.pdf
    • https://cdn.shopify.com/s/files/1/0431/7803/3303/files/nexiwalekawukapuvuwevosej.pdf
    • https://cdn.shopify.com/s/files/1/0432/3144/5156/files/77221802265.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/anatomia_y_funcion_del_higado.pdf
    • https://cdn.shopify.com/s/files/1/0434/1117/7639/files/wonoxazusuluxatexaregi.pdf
    • https://cdn.shopify.com/s/files/1/0430/9227/9460/files/fogukovitab.pdf
    • https://cdn.shopify.com/s/files/1/0433/9574/3907/files/papoboragutux.pdf
    • https://cdn.shopify.com/s/files/1/0430/4489/6925/files/5903059856.pdf
    • https://cdn.shopify.com/s/files/1/0431/7514/9719/files/64166267338.pdf
    • https://cdn.shopify.com/s/files/1/0434/5682/3453/files/theological_terms.pdf
    • https://cdn.shopify.com/s/files/1/0436/6693/1862/files/simon_ielts_writing_task_1_general.pdf
    • https://cdn.shopify.com/s/files/1/0429/1903/5033/files/tilonovasup.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_off00008273.bin
9d39db24cc1e0acab447fdd9a89141a0a28fcf5c3130609a5716d460d8931ee1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8273 5396 bytes
font_01_sfnt_off000094a8.bin
2c0a3468dfcaaa38209ef35fd98c81870b12a1d6a4bae69ab81080c2f4c1c704		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94A8 10012 bytes

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