Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3269c647a20f760…

MALICIOUS

PDF

37.8 KB Created: 2020-08-19 22:12:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc881e833f93c61e4499f42e12b7666f SHA-1: 88a0802841ef054191c781e7c176bd772533f9c8 SHA-256: e3269c647a20f7603c09729bcad59c3dbcdb8807cdb912a69563d58e228e0a0d
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with a critical heuristic firing for a PDF link to known malicious redirector infrastructure. Another critical heuristic indicates a PDF link farm, with 26 generated SEO PDF links. The ML classifier also flagged this PDF as malicious with high confidence. The presence of a redirector URL and a large number of external links suggests an attempt to lure users to malicious sites or to manipulate search engine rankings.

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=tu+aashiqui+serial+song+lyrics
    • http://lisuwezep.bwm.life/uploads/1/3/2/6/132681556/nidim-jiwes.pdf
    • http://files.accentmakeup.com/uploads/1/3/1/8/131872238/4303872.pdf
    • http://files.24hoursforkaitlyn.com/uploads/1/3/2/7/132741482/8768542.pdf
    • https://cdn.shopify.com/s/files/1/0430/8022/0823/files/best_app_to_annotate_ipad.pdf
    • https://cdn.shopify.com/s/files/1/0428/8331/7926/files/mibazabazaxuzobalanoj.pdf
    • https://cdn.shopify.com/s/files/1/0438/0744/1053/files/windows_server_administrator_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0429/6753/1673/files/windows_10_sound_drivers_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wakorijupomimenupe.pdf
    • https://cdn.shopify.com/s/files/1/0434/3611/4076/files/62228638522.pdf
    • https://cdn.shopify.com/s/files/1/0433/6828/4319/files/jovewifiko.pdf
    • https://cdn.shopify.com/s/files/1/0448/3137/5521/files/root_cause_analysis_handbook_third_edition.pdf
    • https://cdn.shopify.com/s/files/1/0430/9060/8285/files/65641955070.pdf
    • https://cdn.shopify.com/s/files/1/0440/1335/5166/files/bill_template_word_free.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_off00004fce.bin
2d11a6f48864fa271425e70e3e64d569a6fcf3397836725652e9c8d19cff37c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x4FCE 5236 bytes
font_01_sfnt_off00006194.bin
0f591bffa0aac7e7a070964937e698f1dca3ab4af642dda966039e55a3a42333
pdf-font-stream PDF embedded font (sfnt) at offset 0x6194 13156 bytes