Malicious PDF — malware analysis report

Static analysis result for SHA-256 274a3bd090cbb56f…

MALICIOUS

PDF

43.0 KB Created: 2020-09-07 18:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1afc2178298ca56284640996e74a40b1 SHA-1: f4729ee5c58aeba71bb62905c46bb3e8ed191cf2 SHA-256: 274a3bd090cbb56f9428e104f45f963f33c19bd6faf7615b2db879a5e563239a
152 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.link/wix?keyword=ekg+technician+resume+template', is identified as a malicious redirector. The document body, though heavily obfuscated, appears to contain text related to 'Ekg technician resume template', suggesting a lure to entice users to click the malicious link. The presence of a large number of external PDF links further indicates a link farm strategy, likely to obscure the malicious destination.

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.link/wix?keyword=ekg+technician+resume+template
    • https://cdn.shopify.com/s/files/1/0431/4464/2715/files/xetiwekakipiniku.pdf
    • https://cdn.shopify.com/s/files/1/0440/8072/6168/files/38279254962.pdf
    • https://cdn.shopify.com/s/files/1/0436/6227/8809/files/star_interview_process_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/1190/7488/files/pivot_stickfigure_animator.pdf
    • https://cdn.shopify.com/s/files/1/0431/4457/7178/files/classic_wow_priest_leveling_guide_spec.pdf
    • https://cdn.shopify.com/s/files/1/0438/7579/5099/files/wiziwurilimasitetibixaso.pdf
    • https://cdn.shopify.com/s/files/1/0459/9044/5213/files/annexure_d_for_pan_card.pdf
    • https://static.usrfiles.com/ugd/b8c837_31acf244f30c48d9ba84016a7ceea100.pdf
    • https://static.usrfiles.com/ugd/ecec20_e101a5127ca1473582e82f8c7085282d.pdf
    • https://static.usrfiles.com/ugd/99a8f2_019630daf50741fb8e23356853f95f37.pdf
    • https://static.usrfiles.com/ugd/c63bf9_542ed8fd5b204b5ea3141ac182d81720.pdf
    • https://cdn.shopify.com/s/files/1/0432/9940/5977/files/79633084493.pdf
    • https://cdn.shopify.com/s/files/1/0433/1136/6309/files/buwigudodatubujodawugu.pdf
    • https://cdn.shopify.com/s/files/1/0434/6455/6710/files/cctv_installation_malayalam.pdf
    • https://cdn.shopify.com/s/files/1/0432/0090/5380/files/13456696377.pdf
    • https://cdn.shopify.com/s/files/1/0436/0781/8398/files/python_capitalize_first_letter_of_each_word.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_off00006a5b.bin
c3a72817a6ca7f84ddb9d1696568dd165087abc684fd9c1b21bb91be442335b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A5B 5368 bytes
font_01_sfnt_off00007c82.bin
1db0364e3791ff92fae7573eb7d2fd688867781be91cbf8096c7de99ac4c285d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C82 10100 bytes

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