Malicious PDF — malware analysis report

Static analysis result for SHA-256 75ebb8feae35dc6a…

MALICIOUS

PDF

44.8 KB Created: 2020-08-10 20:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3e7ac8e448ecca68007b532779f21f82 SHA-1: 0edddc6f0d574ad66812f620a65c676f3c41dc58 SHA-256: 75ebb8feae35dc6a49592424483950e187ce9c38a8b54c9c6e7495a77cff54c9
154 Risk Score

Malware Insights

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

The PDF contains a link farm with over 30 external links, including a primary malicious redirector URL. The document body, though obfuscated, contains text and a URL that appears to be a lure for users to click on these links. The presence of a malicious redirector suggests an attempt to lead users to malicious content or phishing sites.

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=exercises+at+your+desk+pdf
    • http://files.valeriaflorescano.net/uploads/1/3/0/7/130739831/jixebofudedusajisa.pdf
    • http://files.weichunglu.com/uploads/1/3/1/4/131482976/1030742.pdf
    • http://files.colchester-therapies.co.uk/uploads/1/3/0/8/130813601/3697637.pdf
    • http://baloz.abqcraftshows.com/uploads/1/3/0/8/130874317/540cff59.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/1175/1588/files/notatozawezoxedepunone.pdf
    • https://cdn.shopify.com/s/files/1/0433/0763/0747/files/kuxitikato.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vijufetibumumupaxewaromuw.pdf
    • https://cdn.shopify.com/s/files/1/0430/5285/9543/files/82787035302.pdf
    • https://cdn.shopify.com/s/files/1/0428/1604/5222/files/88078172806.pdf
    • https://cdn.shopify.com/s/files/1/0431/8425/9231/files/axis_identification_in_cnc_machine.pdf
    • https://cdn.shopify.com/s/files/1/0434/3277/1750/files/58432711833.pdf
    • https://cdn.shopify.com/s/files/1/0434/6429/4557/files/sopumawapekusutogenase.pdf
    • https://cdn.shopify.com/s/files/1/0434/4804/1637/files/jelixupudorizesojave.pdf
    • https://cdn.shopify.com/s/files/1/0439/3140/2395/files/l_islam_politique.pdf
    • https://cdn.shopify.com/s/files/1/0441/4029/8392/files/asme_ndt_standards.pdf
    • https://cdn.shopify.com/s/files/1/0430/3912/9751/files/bucket_filler_book.pdf
    • https://cdn.shopify.com/s/files/1/0430/0174/1463/files/fatavudavomu.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_off00006f94.bin
beaea27d4546dd8b5c1fb61f7559c069aa6edc56907ae5565043b20db766a73b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F94 5308 bytes
font_01_sfnt_off000081c2.bin
241662857b8fcb17d6934fb00e60029fba9d2d2e0fd3eb90bf35ac29b06db96d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81C2 10572 bytes

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