Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4255bf4c5628ad5…

MALICIOUS

PDF

42.0 KB Created: 2020-08-18 18:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e510bbe7015732061cd765814d0d3b80 SHA-1: 216517472e7ca95bc09a96ddfed12259f7df350a SHA-256: c4255bf4c5628ad51ea9b7e351870bbe3993e6060368b0b213ecdf1611eb46e0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm and a critical redirector link pointing to ttraff.cc, indicating a phishing or redirection attempt. The document body, though heavily obfuscated, contains the same malicious URL and a seemingly benign URL, suggesting a lure to download further content. The ML classifier 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.cc/pify?keyword=betty+crocker+recipe+book+pdf
    • http://files.bluehorizonmassage.com/uploads/1/3/0/7/130740551/2033c333ef.pdf
    • http://files.avantihotelgroup.com/uploads/1/3/2/6/132695995/6980448.pdf
    • http://files.wolflordsaga.com/uploads/1/3/1/4/131437655/fcf544e.pdf
    • https://cdn.shopify.com/s/files/1/0439/9081/0782/files/free_powerpoint_templates_for_technology_presentations.pdf
    • https://cdn.shopify.com/s/files/1/0430/8366/1461/files/lifawafagikugatevaresagod.pdf
    • https://cdn.shopify.com/s/files/1/0433/5042/5750/files/30155526088.pdf
    • https://cdn.shopify.com/s/files/1/0427/9622/0572/files/aldehydes_and_ketones_notes.pdf
    • https://cdn.shopify.com/s/files/1/0439/9572/5982/files/gakija.pdf
    • https://cdn.shopify.com/s/files/1/0435/8999/2616/files/62606285041.pdf
    • https://cdn.shopify.com/s/files/1/0439/4021/6987/files/chinese_cinderella_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0430/8277/6727/files/tuwikunokago.pdf
    • https://cdn.shopify.com/s/files/1/0430/4008/0023/files/my_aol_portfolio.pdf
    • https://cdn.shopify.com/s/files/1/0430/0292/1111/files/tesco_questionnaire_answers_2018.pdf
    • https://cdn.shopify.com/s/files/1/0435/4516/5975/files/11350719227.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3847/files/92436159849.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_off000064ee.bin
668b792755fcd1ef73646231d52e757ae7139913b63add7dc190977396bf8d55
pdf-font-stream PDF embedded font (sfnt) at offset 0x64EE 5084 bytes
font_01_sfnt_off00007656.bin
27cc18d539122d0bbe9ff0e01c1b0026411034546891ed9ee93c5b368c6c0943
pdf-font-stream PDF embedded font (sfnt) at offset 0x7656 10636 bytes