Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cfb3b95aa52cc0a…

MALICIOUS

PDF

41.6 KB Created: 2020-08-25 05:07:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21a8e6325ea7d898fd02c7f4b4c5db0f SHA-1: 265be90663bff7af1b791ccb3a1ce47944b2fdc2 SHA-256: 1cfb3b95aa52cc0a414acd25c7297de5ba5c499c3e33ceb5b05c8c9b37b71d87
154 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 and a large number of embedded external links, suggesting a link farm. The document body explicitly contains the URL https://ttraff.cc/pify?keyword=calculation+sheet+template+word, which is flagged as malicious. This indicates the document's primary purpose is to redirect 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=calculation+sheet+template+word
    • http://files.chrisenrightfinewoodworking.com/uploads/1/3/1/3/131383283/malada_sitofonu.pdf
    • http://files.agrseedandsupply.com/uploads/1/3/1/3/131383493/pogos_womapop.pdf
    • http://files.yunkawasiperu.org/uploads/1/3/0/7/130775373/dorajimunawanotosal.pdf
    • http://files.madisontrinityumc.org/uploads/1/3/0/8/130813961/zutap.pdf
    • http://mixuja.evildragonfiretheater.com/uploads/1/3/2/7/132740720/katiwi.pdf
    • https://cdn.shopify.com/s/files/1/0437/3243/5093/files/pearson_mastering_physics_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0434/6209/9109/files/wufusulazagewasamovugitu.pdf
    • https://cdn.shopify.com/s/files/1/0435/3140/3413/files/police_report_writing.pdf
    • https://cdn.shopify.com/s/files/1/0433/8434/0630/files/hellboy_tamil_dubbed_movie.pdf
    • https://cdn.shopify.com/s/files/1/0435/4431/4024/files/modofulasafewalutigen.pdf
    • https://cdn.shopify.com/s/files/1/0431/7957/3408/files/download_biochemistry_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0431/7331/4715/files/brief_aggression_questionnaire.pdf
    • https://cdn.shopify.com/s/files/1/0435/8737/1171/files/mathswatch_answers_equation_of_a_straight_line.pdf
    • https://cdn.shopify.com/s/files/1/0431/7206/9525/files/94523831364.pdf
    • https://cdn.shopify.com/s/files/1/0430/3906/4225/files/xarija.pdf
    • https://cdn.shopify.com/s/files/1/0457/7152/2214/files/amyloidosis_bcsh_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0428/7148/8668/files/37795951266.pdf
    • https://cdn.shopify.com/s/files/1/0440/5778/8568/files/house_wiring_electrical_symbols.pdf
    • https://cdn.shopify.com/s/files/1/0435/2815/9381/files/2125610180.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_off00006632.bin
d0a315c6a9001a32311421ef27f6fdf517e0344feea0bc904f39dd815531654c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6632 5308 bytes
font_01_sfnt_off00007816.bin
d838d249faf017fd8c5ed00a389851787608f6a1de883cc1ac40b52b39fa5f4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7816 9648 bytes

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