Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c42d897901a6fe0…

MALICIOUS

PDF

43.1 KB Created: 2020-08-10 19:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 5390eedac53370b97c669615cd522782 SHA-1: 13757820867f1f10c117e25967b252776ccc75f9 SHA-256: 5c42d897901a6fe053d9ee135e8ad897f11b9215c6d4a5c33c1aa9944ffd6f7c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which point to external resources. One of these links, 'https://ttraff.ru/pify?keyword=apprendre+le+conjugaison+fran%25C3%25A7ais+pdf', is identified as a malicious redirector. The presence of a link farm and a malicious redirector indicates an attempt to direct users to potentially harmful content, likely for phishing or malware distribution.

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=apprendre+le+conjugaison+fran%25C3%25A7ais+pdf In PDF document text
    • http://files.amestic.org/uploads/1/3/0/9/130969148/1626507.pdfIn PDF document text
    • http://files.marcoaltini.com/uploads/1/3/1/4/131438003/4440901.pdfIn PDF document text
    • http://fudevixan.emanuellutheranludington.org/uploads/1/3/2/6/132681504/3991859.pdfIn PDF document text
    • http://files.itbfm.com/uploads/1/3/1/3/131379590/xadezobe.pdfIn PDF document text
    • http://jenog.navjot-singh.com/uploads/1/3/2/8/132814930/pusiwufu_zisazaxiko_junamutawonowo_biximirojat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0009/4112/files/classroom_of_the_elite_light_novel_volume_8.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/32823332632.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0721/2709/files/81778976580.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6660/5219/files/33777876123.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3488/5789/files/66977070077.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1854/2504/files/66418597264.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6480/0918/files/sorob.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6454/0840/files/93685773732.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vujunuvitiwowus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/7006/0704/files/programma_centrodestra_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7826/2689/files/14033787023.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8714/3839/files/lejisoruvupalu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/9566/8376/files/relieving_letter_format_from_employer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2358/9788/files/sutexetuvomazufivadu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5969/2198/files/64524856300.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6437 5568 bytes
SHA-256: aec2c946867c0cce46341415ad9213fae25aaa59cad27ed5be406a9c040e8d48
font_01_sfnt_off000076ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76ED 11840 bytes
SHA-256: 48e5e6e8249e6aa5a46ef0704fa9a3e306f7a136113ec5392f24c11025381f2b

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