Malicious PDF — malware analysis report

Static analysis result for SHA-256 0419da66ff024b89…

MALICIOUS

PDF

61.5 KB Created: 2020-08-23 23:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 88dc6fb4f324a838d7a579c4f06c9bce SHA-1: 6d4aec27e406ce358761c725f544fb40d98a6c5b SHA-256: 0419da66ff024b8948bd9459f23ea5e988495b2b8393bafd2194eb257eaae437
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=fibromyalgia+treatment+guidelines+pdf', which is also flagged as malicious. This suggests the document is designed to trick users into visiting a malicious site by appearing to offer treatment guidelines.

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.cc/pify?keyword=fibromyalgia+treatment+guidelines+pdf
    • http://vukep.carrollcountyfarmersmarket.org/uploads/1/3/1/0/131070197/bozudiwirebofodawid.pdf
    • http://files.crestwoodbaptist.com/uploads/1/3/1/3/131382841/762961ab3a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6993/9612/files/asset_allocation_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/6459/7397/files/iata_airport_codes_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/1058/0902/files/derudojigumabalanuma.pdf
    • https://cdn.shopify.com/s/files/1/0428/8462/8633/files/42280058325.pdf
    • https://cdn.shopify.com/s/files/1/0434/5587/3190/files/58748913331.pdf
    • https://cdn.shopify.com/s/files/1/0435/7731/1395/files/traumatic_cataract.pdf
    • https://cdn.shopify.com/s/files/1/0434/2795/4854/files/we_are_the_champions._mp3.pdf
    • https://cdn.shopify.com/s/files/1/0435/8655/1971/files/form_css_design_template.pdf
    • https://cdn.shopify.com/s/files/1/0450/1340/1764/files/32212361294.pdf
    • https://cdn.shopify.com/s/files/1/0430/4912/3993/files/97783532446.pdf
    • https://cdn.shopify.com/s/files/1/0431/8475/0741/files/tizovaj.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_off0000b302.bin
223399f7c0aea58132e185236e4a1f441bc50cca0cddc64ced4bbdb0bf18cec3
pdf-font-stream PDF embedded font (sfnt) at offset 0xB302 5556 bytes
font_01_sfnt_off0000c5cd.bin
1982b94045316abda5c348f38039d286d0f521191c1d5fdc867d2588a7e8e920
pdf-font-stream PDF embedded font (sfnt) at offset 0xC5CD 10312 bytes