Malicious PDF — malware analysis report

Static analysis result for SHA-256 867d09e9b2aee0d3…

MALICIOUS

PDF

41.0 KB Created: 2020-08-31 14:17:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1282644e371fe3882eb2fc1a9a7a182f SHA-1: a079c3fd33f9fd9295f317a3cde00073276c292e SHA-256: 867d09e9b2aee0d39692f323d6ed55ebd99c563030b47ec781d40420f1e4e72d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, a common technique for SEO spam and phishing. One prominent link directs to a known malicious redirector at 'ttraff.ru', which is likely used to host further malicious content or redirect to phishing pages. The document body itself contains garbled text but includes the target URL, suggesting an attempt to disguise malicious links within seemingly legitimate 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/wix?keyword=220v+ac+voltage+stabilizer+circuit+diagram+pdf
    • https://cdn.shopify.com/s/files/1/0440/6021/3398/files/dojesekavigipiretijelo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5886/4028/files/malezomivaferaz.pdf
    • https://cdn.shopify.com/s/files/1/0463/2100/8802/files/96437757831.pdf
    • https://cdn.shopify.com/s/files/1/0431/9353/2573/files/business_english_for_beginners_a1.pdf
    • https://cdn.shopify.com/s/files/1/0432/1322/6139/files/despite_in_spite_of_although_even_though_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0429/1887/1207/files/cetoacidosis_alcohlica.pdf
    • https://cdn.shopify.com/s/files/1/0433/5661/8917/files/math_in_the_modern_world_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0436/2321/9363/files/a_tutorial_on_support_vector_machines_for_pattern_recognition.pdf
    • https://cdn.shopify.com/s/files/1/0428/8479/2479/files/10175196824.pdf
    • https://cdn.shopify.com/s/files/1/0433/0212/5733/files/66378050230.pdf
    • https://cdn.shopify.com/s/files/1/0432/5064/7204/files/canon_t3i_manual_video.pdf
    • https://cdn.shopify.com/s/files/1/0427/4877/2508/files/4418385152.pdf
    • https://cdn.shopify.com/s/files/1/0432/7125/8278/files/72821564761.pdf
    • https://static.usrfiles.com/ugd/4479ed_2997960ae8f24f9f8e7082472b0746ea.pdf
    • https://static.usrfiles.com/ugd/db1da1_8270912ceeaa4010845e9ef1665c3a0e.pdf
    • https://static.usrfiles.com/ugd/b8c837_9e97ca742095433ca6b4e60f8d16cf3a.pdf
    • https://static.usrfiles.com/ugd/4b68be_fc642a620cba4a94b170b984e6921185.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000611b.bin
a0cf5e90bc975f9f6534cdf5a70813b3ca69b6daf410dad801ca16aca858a3fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x611B 5904 bytes
font_01_sfnt_off0000751f.bin
fccf96f8a1f4d9b50d44bb049eb12fa528e08c53d3f1c46f251df21294af6932		 pdf-font-stream PDF embedded font (sfnt) at offset 0x751F 9908 bytes

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