Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0c87f52df3bbb1d…

MALICIOUS

PDF

52.4 KB Created: 2020-08-26 18:28:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3791363c44383b8fbe72f1a38e69259f SHA-1: 0dc4c7e35ac961fc116444d6804190470a89dc4d SHA-256: c0c87f52df3bbb1d29dd2397a7e1570403ad352f493686ad5effb17563fcefd4
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by a machine learning classifier and contains numerous embedded links. One critical heuristic identified a link to a known malicious redirector service (ttraff.ru), which likely serves to obscure the ultimate malicious destination. Another critical heuristic indicates the PDF functions as a link farm, with many links pointing to external PDF files, likely for SEO poisoning or to distribute further malicious content. The document body itself is heavily obfuscated and appears to contain the redirector URL.

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.ru/pify?keyword=kippenzwam+wilde+rijstsoep
    • http://butuwi.supershiftery.net/uploads/1/3/1/4/131406686/sevozop.pdf
    • http://suled.proofreading-course.com/uploads/1/3/0/7/130738731/6739610.pdf
    • http://files.europetothepeople.eu/uploads/1/3/0/9/130969708/xewulaju.pdf
    • http://mogodaze.newthaiart.com/uploads/1/3/1/4/131454215/8653989.pdf
    • https://cdn.shopify.com/s/files/1/0434/0970/3061/files/radorewekofis.pdf
    • https://cdn.shopify.com/s/files/1/0439/1007/0440/files/2194563108.pdf
    • https://cdn.shopify.com/s/files/1/0428/3318/2886/files/answer_key_mpsc_combine_2019_pre.pdf
    • https://cdn.shopify.com/s/files/1/0434/9011/5748/files/best_tinkers_construct_pickaxe.pdf
    • https://cdn.shopify.com/s/files/1/0437/9751/2354/files/19593883817.pdf
    • https://cdn.shopify.com/s/files/1/0431/1479/1068/files/dolamusumatezanizulu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7960/6177/files/recombinant_dna_genes_and_genomes_watson.pdf
    • https://cdn.shopify.com/s/files/1/0438/0993/1426/files/75949544902.pdf
    • https://cdn.shopify.com/s/files/1/0433/0671/3253/files/south_african_journal_of_business_management.pdf
    • https://cdn.shopify.com/s/files/1/0427/9785/8972/files/78166803676.pdf
    • https://cdn.shopify.com/s/files/1/0428/5317/1356/files/29248402521.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/
    • https://cdn.shopify.com/s/files/1/0428/5317/1356/fi

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000811d.bin
c60f8bf0b5e463938512633ef04ce29067618c5eef2590579a901e78f65c39a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x811D 5292 bytes
font_01_sfnt_off00009311.bin
6d2a3a16cc464ce72cf05976c7f96a31c93af2202e0dc760c37a694345e222ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9311 1800 bytes
font_02_sfnt_off00009ba1.bin
d53c6ca1b888bf83166a21ec56d7425a825893eb115ff988127f7ff489d6daec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BA1 12664 bytes

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