Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d211d910ca2e2e3…

MALICIOUS

PDF

42.8 KB Created: 2020-08-28 04:32:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb21fc6c9155cc736769362318a3ccde SHA-1: 1c36aad373993991609f0c00da9093be8803c00c SHA-256: 4d211d910ca2e2e34d1843ea244e1339a73acb9bc6f495e95bc0c9503d9b8369
152 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=d%25C3%25A9clinaison+adjectif+possessif+allem'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, one of which is 'http://lurevopij.durbanafrica.co.za/uploads/1/3/0/8/130813765/soguzupofep.pdf'. The document body, though heavily obfuscated, contains the same redirector URL, suggesting the primary intent is to direct users to malicious 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.cc/pify?keyword=d%25C3%25A9clinaison+adjectif+possessif+allem
    • http://lurevopij.durbanafrica.co.za/uploads/1/3/0/8/130813765/soguzupofep.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8758/files/mikogevuge.pdf
    • https://cdn.shopify.com/s/files/1/0433/4708/3418/files/reading_fluency_passages_high_school.pdf
    • https://cdn.shopify.com/s/files/1/0427/4031/8375/files/vedalojezedexev.pdf
    • https://cdn.shopify.com/s/files/1/0430/7461/7511/files/fototropismo_en_las_plantas.pdf
    • https://cdn.shopify.com/s/files/1/0445/5848/3620/files/bootstrap_form_row_group.pdf
    • https://cdn.shopify.com/s/files/1/0438/6209/8085/files/types_of_enzyme_inhibitors.pdf
    • https://cdn.shopify.com/s/files/1/0431/2937/2832/files/wabidutiwotul.pdf
    • https://cdn.shopify.com/s/files/1/0434/4260/2140/files/nikoko.pdf
    • https://cdn.shopify.com/s/files/1/0432/2571/0756/files/james_stewart_calculus.pdf
    • https://cdn.shopify.com/s/files/1/0429/5199/9637/files/ribajazebadupinoz.pdf
    • https://cdn.shopify.com/s/files/1/0438/1917/2000/files/kowafalefokemudenugoweko.pdf
    • https://cdn.shopify.com/s/files/1/0429/7680/5018/files/learning_russian_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0432/0509/9675/files/yahoo_mail_app_not_updating_android.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_off00006503.bin
572807502e9597e9e88a4e0d4aa7c52bf51c3d34048f9b84607bfc75efd58bde
pdf-font-stream PDF embedded font (sfnt) at offset 0x6503 5424 bytes
font_01_sfnt_off00007729.bin
1fbd8e687d77ff93c49a96b9808d5f8440c77ecb9b093af5db3111eeba5910ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x7729 11632 bytes