Malicious PDF — malware analysis report

Static analysis result for SHA-256 da9ef425497a31d6…

MALICIOUS

PDF

38.0 KB Created: 2020-08-23 16:33:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f406ce5d256eb86b439ca450ba83178 SHA-1: a58b0334367b68d04f5f0bbf34aa8d40ffc75ac5 SHA-256: da9ef425497a31d6d5c3f713f51413817cafaf1f6d144cc3911cb49509fb2dc4
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=b.+p.+e+full+form'. Additionally, it exhibits a PDF link farm pattern, with numerous embedded links, many of which are to Shopify-hosted PDFs. The ML classifier also strongly flagged this PDF as malicious. The document body contains garbled text but includes the malicious URL, suggesting a lure to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=b.+p.+e+full+form
    • http://files.somersbyschoolofarts.org/uploads/1/3/1/4/131406365/0264a5300eb89c.pdf
    • http://xokato.mrswagner.net/uploads/1/3/0/9/130969352/5800575.pdf
    • http://pemas.partyrockers.ca/uploads/1/3/0/8/130814328/fusinimurunez.pdf
    • http://files.justactstrategy.com/uploads/1/3/1/6/131606094/nagobiruz_gituzeje_zuwuxima.pdf
    • https://cdn.shopify.com/s/files/1/0432/1017/8717/files/dibrugarh_university_bsc_mathematics_syllabus_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/5552/0667/files/33308474265.pdf
    • https://cdn.shopify.com/s/files/1/0431/1960/7962/files/akuntansi_pajak_lanjutan.pdf
    • https://cdn.shopify.com/s/files/1/0446/7671/0563/files/8th_grade_math_curriculum_map.pdf
    • https://cdn.shopify.com/s/files/1/0431/5843/8039/files/biborosikat.pdf
    • https://cdn.shopify.com/s/files/1/0440/6345/7432/files/broilers_farming_in_kenya.pdf
    • https://cdn.shopify.com/s/files/1/0443/0407/2860/files/poulan_chainsaw_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/7243/8951/files/zewokorofezotuguginejiguv.pdf
    • https://cdn.shopify.com/s/files/1/0438/8179/1643/files/frozen_songs_ming.pdf
    • https://cdn.shopify.com/s/files/1/0430/0875/3827/files/13610770378.pdf
    • https://cdn.shopify.com/s/files/1/0436/5844/4958/files/guided_tour_holidays_to_australia.pdf
    • https://cdn.shopify.com/s/files/1/0437/0402/5242/files/allweiler_centrifugal_pump_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0433/8126/0440/files/rubekebemowuweta.pdf
    • https://cdn.shopify.com/s/files/1/0439/3431/8760/files/junekelez.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_off000058cd.bin
0568753cd42f3f0b9248e5be8c972b40ca20a419972e5350eece4576269fb714
pdf-font-stream PDF embedded font (sfnt) at offset 0x58CD 4740 bytes
font_01_sfnt_off000068dd.bin
28e49c8c8ceef29a1d6572b383ff6740f692cb63fd748fb8c371c501092ec64b
pdf-font-stream PDF embedded font (sfnt) at offset 0x68DD 10144 bytes