Malicious PDF — malware analysis report

Static analysis result for SHA-256 a201493ab5d56b54…

MALICIOUS

PDF

50.7 KB Created: 2020-08-20 07:25:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3770d2bc6fa479fad2142bde925acfbe SHA-1: 6db5df55b1fc2cac622284cab86da4de0c551076 SHA-256: a201493ab5d56b5488c81cd7e60aaf3eb87ce68ce6a92b83a9564e79f2ef5e80
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. Another critical heuristic identifies a PDF link farm, suggesting a malicious intent to manipulate search engine results or redirect users. The ML classifier also strongly flagged this PDF as malicious. The primary malicious IOC is the redirector URL.

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.com/pify?keyword=daterangepicker+format+time
    • http://files.angelawilsonpt.co.uk/uploads/1/3/0/9/130969470/jokivujaxede_dibatadiwavelif.pdf
    • https://cdn.shopify.com/s/files/1/0432/6627/7531/files/jimarefugovojeka.pdf
    • https://cdn.shopify.com/s/files/1/0431/7495/3124/files/in_order_traversal.pdf
    • https://cdn.shopify.com/s/files/1/0433/4590/3774/files/76882302028.pdf
    • https://cdn.shopify.com/s/files/1/0429/1110/5183/files/american_english_easy_learning.pdf
    • https://cdn.shopify.com/s/files/1/0431/8353/8331/files/80494588293.pdf
    • https://cdn.shopify.com/s/files/1/0432/9147/6133/files/38615005981.pdf
    • https://cdn.shopify.com/s/files/1/0429/8797/8913/files/xunagoxigasowatizil.pdf
    • https://cdn.shopify.com/s/files/1/0437/2480/0154/files/brave_not_perfect_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/0017/6544/files/21_cfr_part_111_audit_checklist.pdf
    • https://cdn.shopify.com/s/files/1/0429/0537/0787/files/all_bodyweight_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0432/6686/7364/files/coerced_confession.pdf
    • https://cdn.shopify.com/s/files/1/0430/5374/4279/files/ubuntu_server_hardening.pdf
    • https://cdn.shopify.com/s/files/1/0439/6885/6222/files/vrchat_full_body_tracking_fingers.pdf
    • https://cdn.shopify.com/s/files/1/0438/7019/1771/files/jebemexejajazajuf.pdf
    • https://cdn.shopify.com/s/files/1/0436/3331/1904/files/2423349173.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_off00008786.bin
b0de0416515f52a486daaef96d8177eedc836cfe735d59071e4802e0af2097a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x8786 5188 bytes
font_01_sfnt_off00009923.bin
d5bca2e96b41a09295e5078e3c204ba5d4758d691992352624144ca4cfc4430e
pdf-font-stream PDF embedded font (sfnt) at offset 0x9923 10716 bytes