Malicious PDF — malware analysis report

Static analysis result for SHA-256 770f0166525678a1…

MALICIOUS

PDF

43.8 KB Created: 2020-08-09 16:14:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a647703d40ad8ce49dd84502d2ec74a SHA-1: f90440393f1d4513b9560ae20f09604549625dc6 SHA-256: 770f0166525678a1da8e81c6c029fb9c9caf338304c4a5a8d0af97726e31f934
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, which is indicative of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=que+son+calicatas+pdf'. The ML classifier also strongly flagged this PDF as malicious. The presence of embedded URLs and the link farm structure suggest 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=que+son+calicatas+pdf
    • http://files.tcstars.com/uploads/1/3/0/7/130775062/xoredafane.pdf
    • http://files.firebirdnewzeal.org/uploads/1/3/1/8/131856105/9cfd0e2233.pdf
    • http://files.centralok.usafachapters.org/uploads/1/3/2/8/132814305/kakujamorapib-webegif.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/3123/2674/files/rizuranelosotelisulogeton.pdf
    • https://cdn.shopify.com/s/files/1/0435/7485/3793/files/failed_to_acquire_the_virtualbox_com_object.pdf
    • https://cdn.shopify.com/s/files/1/0432/6372/1637/files/biology_gcse_questions.pdf
    • https://cdn.shopify.com/s/files/1/0435/9343/3246/files/3350678528.pdf
    • https://cdn.shopify.com/s/files/1/0427/6020/8540/files/calendar_2020_malayalam.pdf
    • https://cdn.shopify.com/s/files/1/0432/2567/7982/files/62966863649.pdf
    • https://cdn.shopify.com/s/files/1/0432/0660/7005/files/64966802924.pdf
    • https://cdn.shopify.com/s/files/1/0439/4447/6840/files/aditya_hrudayam_lyrics_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0440/8541/1990/files/free_obituary_program_template_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/5893/8531/files/taralobadetatadedetipil.pdf
    • https://cdn.shopify.com/s/files/1/0429/2476/9436/files/24536764130.pdf
    • https://cdn.shopify.com/s/files/1/0430/8752/8103/files/58216847288.pdf
    • https://cdn.shopify.com/s/files/1/0437/9066/3832/files/xipowekodipekinaraxakibo.pdf
    • https://cdn.shopify.com/s/files/1/0437/6638/2746/files/dolasojibuzegi.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_off00006d04.bin
18982f4e257c811e081e8546c53ca2beb4f1bcf27c6a887e94c97b6aa11e310c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D04 5112 bytes
font_01_sfnt_off00007e80.bin
eb21d15e9dcd5523c97b105f5e696c990f98f9149a5f5cb09e479986997e0df7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E80 10744 bytes

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