Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dfdbb726efa2624…

MALICIOUS

PDF

47.0 KB Created: 2020-08-10 03:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b6a3d30e94b8039a354e0c440385cfc SHA-1: 736576b7f94b2cf956a417178fe1b5758ee4a527 SHA-256: 6dfdbb726efa262407df7145d8cbffd34228c712d8eec844c4defc61bb6c7749
154 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, forming a link farm, and directs users to a known malicious redirector. The document body text, though heavily obfuscated, contains the URL https://ttraff.ru/pify?keyword=built+with+science+beginner+shred+pdf, which is the primary indicator of malicious intent. The presence of many links to external PDFs, some of which are hosted on benign platforms like Shopify, suggests a tactic to obscure the malicious redirector among legitimate-looking 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.ru/pify?keyword=built+with+science+beginner+shred+pdf
    • http://files.ruthdeyoung.com/uploads/1/3/0/8/130873947/peduwab_walirulofosi_mixabajuvunana.pdf
    • http://xujeri.radicoolair.com/uploads/1/3/1/0/131070450/210629ffa249362.pdf
    • http://vuxonuv.virginiaintegrativeosteopathy.com/uploads/1/3/1/4/131407005/749817119.pdf
    • http://dasot.imagebunny.com/uploads/1/3/0/7/130738970/tanarojifiwovo_fudedu.pdf
    • http://files.stdavidsprimary.co.uk/uploads/1/3/2/7/132740525/608b6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/9438/5575/files/ubuntu_ipsec_vpn_server.pdf
    • https://cdn.shopify.com/s/files/1/0430/0157/7625/files/47553845424.pdf
    • https://cdn.shopify.com/s/files/1/0433/1739/5611/files/78603063526.pdf
    • https://cdn.shopify.com/s/files/1/0440/6090/1528/files/wafejawigote.pdf
    • https://cdn.shopify.com/s/files/1/0433/0926/9156/files/89916568207.pdf
    • https://cdn.shopify.com/s/files/1/0429/4885/3926/files/60688126440.pdf
    • https://cdn.shopify.com/s/files/1/0441/2728/9496/files/cctv_camera_training.pdf
    • https://cdn.shopify.com/s/files/1/0429/8611/1137/files/fupazokuxumulerub.pdf
    • https://cdn.shopify.com/s/files/1/0435/6086/1845/files/adoption_agency_form.pdf
    • https://cdn.shopify.com/s/files/1/0436/6496/5782/files/lepuxulefujedebojosir.pdf
    • https://cdn.shopify.com/s/files/1/0431/1449/6161/files/aircraft_structure_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/7329/7822/files/kiriwelerawirupibetuloti.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_off000078b1.bin
355e4639740889114721a3d504045da51d370810faa6f7ac8675a095a7158abe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78B1 5488 bytes
font_01_sfnt_off00008b6f.bin
ba6924badf4aa24bb11b84e9414a71489dc7a743719260e3ad6551ac9859b430		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B6F 10496 bytes

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