Malicious PDF — malware analysis report

Static analysis result for SHA-256 05f87bba6c410af3…

MALICIOUS

PDF

31.6 KB Created: 2020-11-03 03:23:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a36d74d0e39ecb0275134b6b73bbe66c SHA-1: 129e20a9fa797b26038a823d3d0d57b02b190f31 SHA-256: 05f87bba6c410af36a48fc7f6ee6fd767c6fbbc95a02abb3ffb19b50b3b8e521
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be part of an SEO link farm strategy. The presence of numerous PDF links and a critical redirector firing strongly suggests an attempt to drive traffic to malicious infrastructure, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://ggtraff.ru/aws?keyword=multi+digit+multiplication+song
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0502/7545/1053/files/descargar_aplicaciones_android_gratis_para_juegos.pdf
    • https://s3.amazonaws.com/fosagoba/easy_violin_and_cello_duets.pdf
    • https://s3.amazonaws.com/kepevipawit/how_would_you_build_a_csirt_what_are_the_components_to_building_an_effective_team.pdf
    • https://s3.amazonaws.com/farezelof/granular_activated_carbon.pdf
    • https://cdn.shopify.com/s/files/1/0482/0798/6845/files/10509800298.pdf
    • https://s3.amazonaws.com/vuforewebub/15249282688.pdf
    • https://s3.amazonaws.com/nemafu/xazax.pdf
    • https://uploads.strikinglycdn.com/files/fd461ed1-15c2-444c-a9fa-ab9fdd4d0b83/wowakafimijixive.pdf
    • https://s3.amazonaws.com/dixaleko/central_asia_map.pdf
    • https://s3.amazonaws.com/liwafo/food_allergens_list.pdf
    • https://cdn.shopify.com/s/files/1/0502/7810/5250/files/ponaris_nasal_emollient.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_off000040d3.bin
cb5b6aaca119602f49e65a45f676b4289dfc67953e70c6efa12ef6de4f52e261		 pdf-font-stream PDF embedded font (sfnt) at offset 0x40D3 5304 bytes
font_01_sfnt_off000052d8.bin
59146a021fadbd481ce77101413e1e0e0f436a1ef83b1ff5c52bdfde3ecc2708		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52D8 9136 bytes

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