Malicious PDF — malware analysis report

Static analysis result for SHA-256 e983e85ab588455f…

MALICIOUS

PDF

41.1 KB Created: 2020-08-14 23:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1319eaaa3cf007e3239f7d0dcc1a903 SHA-1: fb6e4438c0e010020e3dae86409815a96f64e32d SHA-256: e983e85ab588455fab2556ad766cc74570e41690122609a893bfddc21d612d64
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating it points to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/pify?keyword=best+exposure+bracketing+android, which is likely intended to lure the user to a malicious site. The presence of a large number of external links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute the 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.ru/pify?keyword=best+exposure+bracketing+android
    • http://files.northbuffalopresbyterian.com/uploads/1/3/0/9/130968988/9673468.pdf
    • http://files.nurrd.com/uploads/1/3/2/7/132710795/zagezekozalasodo.pdf
    • http://ribusu.kindred-sol.net/uploads/1/3/1/4/131438539/ba75067539.pdf
    • https://cdn.shopify.com/s/files/1/0428/5746/3971/files/27674151968.pdf
    • https://cdn.shopify.com/s/files/1/0435/8724/0093/files/sadudenavavutafum.pdf
    • https://cdn.shopify.com/s/files/1/0430/8362/8697/files/ronumot.pdf
    • https://cdn.shopify.com/s/files/1/0432/3426/3199/files/besosemixobu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/57189589950.pdf
    • https://cdn.shopify.com/s/files/1/0434/4024/2840/files/35697090318.pdf
    • https://cdn.shopify.com/s/files/1/0438/2159/6834/files/raspberry_pi_opencv.pdf
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/adding_fractions_worksheets_grade_6.pdf
    • https://cdn.shopify.com/s/files/1/0433/6956/2266/files/bevogofunotazewow.pdf
    • https://cdn.shopify.com/s/files/1/0440/0922/6398/files/25364717030.pdf
    • https://cdn.shopify.com/s/files/1/0428/8777/4374/files/biblia_cristiana_nuevo_testamento.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_off00006266.bin
2bcb8681aaf43f8f03b62fcf1245a75cd0cc29899b3408a180057d7947080522
pdf-font-stream PDF embedded font (sfnt) at offset 0x6266 5532 bytes
font_01_sfnt_off00007540.bin
339039d38e098290775eb5b9c636b6a7e92e1a2a5f27ca35891ab7a0b1afb79f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7540 10080 bytes