Malicious PDF — malware analysis report

Static analysis result for SHA-256 61a03e72d1a944d0…

MALICIOUS

PDF

44.5 KB Created: 2020-08-10 01:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6f1e76384a8693b4aed793b0e199f7b8 SHA-1: 2ac64366de47c9071441f6c56e7e6c3a47281c0e SHA-256: 61a03e72d1a944d0d1b9171c5c233119a53f30bd6e1ef39575388bc7c4b0c705
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though partially garbled, includes the URL 'https://ttraff.ru/pify?keyword=cirrose+hep%25C3%25A1tica+medicamentosa+pdf', suggesting a lure related to medical information. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, likely for SEO manipulation or to distribute malicious content. The ML classifier 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.ru/pify?keyword=cirrose+hep%25C3%25A1tica+medicamentosa+pdf
    • http://zigate.stallionscouts.org/uploads/1/3/1/1/131164250/teforo_jovigenufu_witeles_dipogasisavi.pdf
    • http://xemev.juanodeon.com/uploads/1/3/1/4/131453060/2438641.pdf
    • http://papomupix.autobodyassociation.org/uploads/1/3/1/4/131483281/gasubodewuxiji-maziba.pdf
    • http://files.videotrowbridge.org/uploads/1/3/1/0/131070178/pimugixavegezo.pdf
    • http://files.worldbaseballalliance.org/uploads/1/3/0/7/130738704/tifuxadi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/9097/5645/files/jexulepusupomolusora.pdf
    • https://cdn.shopify.com/s/files/1/0432/3606/5438/files/84618391522.pdf
    • https://cdn.shopify.com/s/files/1/0427/7154/6279/files/99933304746.pdf
    • https://cdn.shopify.com/s/files/1/0427/5165/6102/files/39862297094.pdf
    • https://cdn.shopify.com/s/files/1/0434/3490/1660/files/17341592859.pdf
    • https://cdn.shopify.com/s/files/1/0437/1909/8522/files/witatuponazobi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0792/5654/files/wisudekugiwumirusar.pdf
    • https://cdn.shopify.com/s/files/1/0430/9896/4117/files/barter_system_history.pdf
    • https://cdn.shopify.com/s/files/1/0431/2698/0770/files/zamzar_convert_to_word.pdf
    • https://cdn.shopify.com/s/files/1/0431/0047/1456/files/jixipel.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_off00006af9.bin
cb953200d5a91762878d1120da1127eeb8e44766e0a7d8b1ec86c92e80799042		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AF9 5500 bytes
font_01_sfnt_off00007cee.bin
4d7d1214437ef77108eb4c7caa7804f3bbad7f169546a19ea4d06961a118a4dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CEE 12688 bytes

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