Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ad77ed91e4668a0…

MALICIOUS

PDF

38.8 KB Created: 2020-08-23 07:23:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa39b87cea5c9e5c8088a2f19a2d8b4d SHA-1: 35b8bc89a7cde294fb74d87b283643167b85bd19 SHA-256: 9ad77ed91e4668a0cb650a77347a8dc35b3ce8a8fdac47db5b6f0fe27b40531c
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, forming a link farm. One of these links, 'https://ttraff.cc/pify?keyword=the+masculine+gender+of+spinster+answers', points to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body itself is heavily obfuscated and contains a mix of text and URLs, suggesting it's designed to lure users into clicking malicious links.

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=the+masculine+gender+of+spinster+answers
    • http://files.jugglingforjustice.org/uploads/1/3/1/0/131070581/timunigusefotuk-kitezila.pdf
    • http://files.shavanocreek.com/uploads/1/3/1/3/131398159/tazok.pdf
    • http://files.dodici-azpadu.com/uploads/1/3/1/6/131606951/januwuk.pdf
    • http://files.rockwellamezchurch.org/uploads/1/3/1/6/131607029/466965.pdf
    • http://wamusiw.forestheightsacademyofexcellence.org/uploads/1/3/1/8/131857920/xulituxezusevi-komugudaw-tezajoko.pdf
    • https://cdn.shopify.com/s/files/1/0437/1673/9222/files/3791802288.pdf
    • https://cdn.shopify.com/s/files/1/0429/9577/7699/files/63508725951.pdf
    • https://cdn.shopify.com/s/files/1/0434/8716/6628/files/penejodu.pdf
    • https://cdn.shopify.com/s/files/1/0428/1411/1903/files/krishna_s_textbook_probability_theory.pdf
    • https://cdn.shopify.com/s/files/1/0437/5629/0206/files/characteristics_of_a_project_report_writing.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wirokole.pdf
    • https://cdn.shopify.com/s/files/1/0434/4040/6684/files/pirubijosasozi.pdf
    • https://cdn.shopify.com/s/files/1/0440/2089/1798/files/aakash_2018_answer_key_neet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000445d.bin
02d07de8dd8f1d5145c5256d5627bf468c2b08dfb4f9b52726e91279a64ccef4
pdf-font-stream PDF embedded font (sfnt) at offset 0x445D 5492 bytes
font_01_sfnt_off000056ea.bin
8858712932ef0ac23befcad18c317e6c320471765d1d94b41a1b5fa3004e34f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x56EA 13416 bytes
font_02_sfnt_off00008054.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x8054 4324 bytes