Malicious PDF — malware analysis report

Static analysis result for SHA-256 7458b6c1b583c494…

MALICIOUS

PDF

40.4 KB Created: 2020-08-12 10:33:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19de681277513d527ec7f81ef2683582 SHA-1: a873c24465ca1762f8a6885aa4f84c841215331c SHA-256: 7458b6c1b583c4947cae782f193aa2e4c28019b5c91c9fa5fd9c33c9bf29ef9f
154 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many pointing to external PDF files, which is indicative of a link farm. One of the primary links, 'https://ttraff.com/pify?keyword=anglo+norman+studies+pdf', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL, suggesting the document's purpose is to redirect users to potentially harmful 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=anglo+norman+studies+pdf
    • http://sosoti.donbosco.amsterdam/uploads/1/3/0/7/130739415/jozosixamizaz.pdf
    • http://wewuk.polizzigenealogy.com/uploads/1/3/2/6/132682137/giwobu.pdf
    • http://wowuduku.drheidiwellness.com/uploads/1/3/1/4/131483083/5e63bafb16.pdf
    • http://files.threeblockmodel.com/uploads/1/3/2/6/132681392/9929703.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/3160/0031/files/qemu-_img_resize.pdf
    • https://cdn.shopify.com/s/files/1/0432/8072/8224/files/89645932942.pdf
    • https://cdn.shopify.com/s/files/1/0431/5840/5271/files/1997_seadoo_gtx.pdf
    • https://cdn.shopify.com/s/files/1/0432/0188/8416/files/basic_linux_networking_commands.pdf
    • https://cdn.shopify.com/s/files/1/0430/7199/6053/files/36481256358.pdf
    • https://cdn.shopify.com/s/files/1/0431/1698/6534/files/zajifuzosopi.pdf
    • https://cdn.shopify.com/s/files/1/0438/7789/2251/files/biopsychology_tenth_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/4995/1138/files/bovuzuneworotekusijiminuv.pdf
    • https://cdn.shopify.com/s/files/1/0440/9013/0584/files/california_fish_grill_nutrition.pdf
    • https://cdn.shopify.com/s/files/1/0429/2768/5799/files/84575749167.pdf
    • https://cdn.shopify.com/s/files/1/0427/7954/1671/files/livro_ortopedia_e_traumatologia.pdf
    • https://cdn.shopify.com/s/files/1/0435/8039/1585/files/mesinowikufefuvasekixix.pdf
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/nowetakibev.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_off00005fde.bin
6580bd68859e582524e4945847477a53e24ef6e51f5d280667695d80fdeb17a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FDE 5348 bytes
font_01_sfnt_off000071f1.bin
fa78f7563db84b3e43ce26eb498e1d0a920d331ab7f5850d86b325cdc345cad2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71F1 10240 bytes

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