Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a7b1555e504d8f1…

MALICIOUS

PDF

53.3 KB Created: 2020-08-18 21:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca1ecd6f7a98f256e67e34d8528258ad SHA-1: ef06bb3f2cbfedbf024b1f182b149f34bf2f11c3 SHA-256: 0a7b1555e504d8f116e15c180cf1c4e794a03273f84322edab3701cfdac85b2f
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be the primary malicious payload delivery mechanism. The ML classifier strongly indicates maliciousness, supporting the conclusion that this PDF is designed to lure users to harmful 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=cataratas+del+iguazu+informacion+wikipedia
    • http://files.dmbrepairs.co.uk/uploads/1/3/1/4/131452836/53782c7a576.pdf
    • http://files.stetsonrowles.com/uploads/1/3/0/7/130775677/xobixodizo_xirav_nomovivozoz.pdf
    • http://jolewilu.nspartners.com/uploads/1/3/1/6/131606875/goziti_fokogebadadujol_magum_sudow.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/49726552648.pdf
    • https://cdn.shopify.com/s/files/1/0432/7899/1518/files/linubinitilebep.pdf
    • https://cdn.shopify.com/s/files/1/0434/3873/5517/files/85713905572.pdf
    • https://cdn.shopify.com/s/files/1/0443/9041/6550/files/stockholm_bryony_lavery.pdf
    • https://cdn.shopify.com/s/files/1/0431/3910/4917/files/86925073873.pdf
    • https://cdn.shopify.com/s/files/1/0427/9776/0668/files/mci_bus_manuals.pdf
    • https://cdn.shopify.com/s/files/1/0429/7703/4399/files/givugobelofimetageju.pdf
    • https://cdn.shopify.com/s/files/1/0433/9236/8798/files/tuxof.pdf
    • https://cdn.shopify.com/s/files/1/0431/5637/3670/files/current_immunization_schedule_in_kenya.pdf
    • https://cdn.shopify.com/s/files/1/0429/8866/7034/files/49746667802.pdf
    • https://cdn.shopify.com/s/files/1/0429/6045/3785/files/jokizunajogewixuvel.pdf
    • https://cdn.shopify.com/s/files/1/0430/6511/4775/files/apprendre__parler_portugais.pdf
    • https://cdn.shopify.com/s/files/1/0435/3871/0696/files/87710871642.pdf
    • https://cdn.shopify.com/s/files/1/0432/1509/3924/files/jedukapoweku.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_off00008b67.bin
5756f088210dc7238c65dfa85586af44d89ce233f249c3bb1e92208202e8d2ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B67 5588 bytes
font_01_sfnt_off00009e70.bin
7f3c45238cf5b55e9edcf4c20ba92ba3f3fcdf36e8bf51f0cdfe229600a7195b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E70 12484 bytes

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