Malicious PDF — malware analysis report

Static analysis result for SHA-256 7254a4e9a7114cd1…

MALICIOUS

PDF

67.6 KB Created: 2020-08-21 16:17:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9cf3c97e7009aef736cfd30b95117dc2 SHA-1: 6dbcddcf1ee61cd7d12cf590155d1470660a428d SHA-256: 7254a4e9a7114cd1c67d91610b19fa7a1429a93178c6c26d13d56b463e3e0155
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, constituting a link farm. One of these links, 'https://ttraff.ru/pify?keyword=evidence+based+medicine+clinical+practice+guidelines', is identified as a malicious redirector, indicating a potential phishing or malware distribution attempt. The ML classifier also 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=evidence+based+medicine+clinical+practice+guidelines
    • http://files.samanthanathey.com/uploads/1/3/1/8/131856173/8277457.pdf
    • http://files.starladeanmft.com/uploads/1/3/1/3/131381675/zisesitolimogedaxebi.pdf
    • http://files.dallasclinicalpsychology.com/uploads/1/3/2/6/132681482/fuxozup_jixeruzodamozu.pdf
    • http://files.explicationcentral.com/uploads/1/3/1/3/131381605/jejijasarug_vagapovafukenuk.pdf
    • http://siworobub.breckinridgecountyfair.com/uploads/1/3/1/4/131483068/3251483.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/6856/9238/files/examples_of_simile.pdf
    • https://cdn.shopify.com/s/files/1/0431/0473/1300/files/print_handwriting_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0428/8839/6959/files/kendo_ui_scheduler_editable_template.pdf
    • https://cdn.shopify.com/s/files/1/0439/1639/4648/files/44245505617.pdf
    • https://cdn.shopify.com/s/files/1/0433/9394/1671/files/introduction_to_robotics_craig.pdf
    • https://cdn.shopify.com/s/files/1/0433/5291/6119/files/immunization_records_washington_state_form.pdf
    • https://cdn.shopify.com/s/files/1/0437/7152/7325/files/nunogijuxutonijafemepojel.pdf
    • https://cdn.shopify.com/s/files/1/0436/1427/3698/files/tetadam.pdf
    • https://cdn.shopify.com/s/files/1/0435/5689/6927/files/49764582477.pdf
    • https://cdn.shopify.com/s/files/1/0431/1272/6677/files/dusubeniselajujoxoli.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_off0000c931.bin
a43982db45b918e0dd563496aa3a3a1d70a4952a256ddf1a5c14d2eeb58eed87		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC931 5548 bytes
font_01_sfnt_off0000dbf0.bin
b7319095690ab23e8372c229299645c1bfd28838d5b2e9d2a05fd7baf7cd488d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF0 10920 bytes

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