Malicious PDF — malware analysis report

Static analysis result for SHA-256 3214e3c4c6dadb08…

MALICIOUS

PDF

47.1 KB Created: 2020-08-11 19:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16c22bf3f47530bd8e9336bb92762f91 SHA-1: a31a0fc5593f39ed0dd74e3a0b1acb79e2db2d8b SHA-256: 3214e3c4c6dadb08701dee7e0cf9a4334e03b28e5780306ba6a002679622a16a
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical heuristic firing for a malicious redirector. The embedded URL 'https://ttraff.cc/pify?keyword=small+scale+business+in+nigeria+pdf' is designed to redirect users to malicious infrastructure. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs. The ML classifier also strongly indicated maliciousness.

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=small+scale+business+in+nigeria+pdf
    • http://files.maradovisphoto.com/uploads/1/3/0/7/130738915/kojolikazub.pdf
    • http://files.opportunityknits.com/uploads/1/3/1/4/131408203/kumibed.pdf
    • http://files.windsorbaptistchurchil.org/uploads/1/3/1/0/131070313/wamezifu.pdf
    • http://files.thehealthyroot.com/uploads/1/3/1/4/131438268/8961193.pdf
    • http://files.samanthajade.co.uk/uploads/1/3/1/3/131398076/9f53052c438.pdf
    • http://files.opportunityknits.com/uploads/1/3/1/4/131408203/kumibed.p
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/48230959778.pdf
    • https://cdn.shopify.com/s/files/1/0428/8030/3263/files/77578680479.pdf
    • https://cdn.shopify.com/s/files/1/0433/4754/2175/files/keyboard_input_java.pdf
    • https://cdn.shopify.com/s/files/1/0431/0519/0041/files/believe_me_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/7446/1589/files/5512131859.pdf
    • https://cdn.shopify.com/s/files/1/0436/9580/0475/files/fiwolexinumusosikomedezuw.pdf
    • https://cdn.shopify.com/s/files/1/0435/8563/4463/files/pebinupakudiwekigat.pdf
    • https://cdn.shopify.com/s/files/1/0432/9983/1968/files/fekiregisonukobev.pdf
    • https://cdn.shopify.com/s/files/1/0440/2115/3957/files/advanced_data_structures_and_algorithms_notes_for_me_cse.pdf
    • https://cdn.shopify.com/s/files/1/0432/6499/9588/files/kung_lao_fatality.pdf
    • https://cdn.shopify.com/s/files/1/0437/1467/4841/files/internal_validity_in_quantitative_research.pdf
    • https://cdn.shopify.com/s/files/1/0448/2108/6365/files/bodyweight_workout_for_mass.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_off00007770.bin
bbb716214fed563dc667d6c5db67a9debcd16cb95cac652c2b9e51efffba654a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7770 5716 bytes
font_01_sfnt_off00008ab0.bin
3bf1c01d092da6522147691779dc7409b32b20054ddc499a9a5fb9a8a9b16978		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AB0 10652 bytes

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