Malicious PDF — malware analysis report

Static analysis result for SHA-256 689b548460ea144c…

MALICIOUS

PDF

48.2 KB Created: 2020-08-08 14:26:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f15432fa450019b3c15a6dcb3b043ca8 SHA-1: d164535840894d6704b608cc0980088e64b449b9 SHA-256: 689b548460ea144c2104664d4b19c92e709ba362c8267d4e6b2d8f0286863c60
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a link farm designed to generate SEO traffic. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=approximation+and+percentage+error+pdf', indicating a phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as malicious.

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.cc/pify?keyword=approximation+and+percentage+error+pdf
    • http://files.montessorilawrence.org/uploads/1/3/2/6/132682758/xugoseg.pdf
    • http://files.feathersmediums.co.uk/uploads/1/3/1/8/131856567/5d953203538c6.pdf
    • http://files.dogodogo.ru/uploads/1/3/2/7/132712233/a765cf91460497.pdf
    • http://files.busybeesclifford.com/uploads/1/3/0/7/130739202/6537720.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/1321/8199/files/total_cholesterol_test.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71409998288.pdf
    • https://cdn.shopify.com/s/files/1/0433/8896/0933/files/pdf_file_reader_app_download_for_pc.pdf
    • https://cdn.shopify.com/s/files/1/0433/3443/4969/files/ophthalmology_abbreviations.pdf
    • https://cdn.shopify.com/s/files/1/0429/8804/4442/files/danukokosiku.pdf
    • https://cdn.shopify.com/s/files/1/0431/8006/4936/files/tijoxozudim.pdf
    • https://cdn.shopify.com/s/files/1/0440/6162/2437/files/carotenoids_book.pdf
    • https://cdn.shopify.com/s/files/1/0438/4735/2480/files/54317603224.pdf
    • https://cdn.shopify.com/s/files/1/0432/8200/6171/files/example_of_memorandum_letter.pdf
    • https://cdn.shopify.com/s/files/1/0437/8558/4801/files/ashcroft_pressure_gauge.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068f1.bin
65a63bb6eaf749e92ad8bfdacf85dcb8f21b65deb1d9917f765e7921d73127e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68F1 5108 bytes
font_01_sfnt_off00007a36.bin
1dafe5707e528e43d292cc46f7aa2de2a7e070fc6f6f0f35da4e22a88aa84df7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A36 13368 bytes
font_02_sfnt_off0000a535.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA535 4324 bytes

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