Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bdc0a8cb9a6df1d…

MALICIOUS

PDF

49.1 KB Created: 2020-10-26 01:12:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 9b2fa58fe1ce58942dd33094771102ea SHA-1: 4c0c41a466d919b3bfe96c54a3d057607cc30309 SHA-256: 7bdc0a8cb9a6df1d17dbd9cbfd12c2380b56d3b0fa1b61fdafaf12072f994414
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK pointing to ggtraff.ru. Another critical heuristic, PDF_SEO_LINK_FARM, indicates a large number of external PDF links, suggesting a link farm. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL, indicating an attempt to redirect the user.

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://ggtraff.ru/pify?keyword=best+manual+lawn+edge+trimmer In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368952/normal_5f8d0327be27d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385202/normal_5f8d07dd973f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374699/normal_5f9056cdd3a9d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a2cce10-8c6a-43b9-a3fb-0ed3199525f0/jumojesafadenezi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52722339-633b-4cf5-8100-274c12e22b76/82441594936.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5338ef17-1c8f-434f-9caa-dab2ddf0177e/nodadomesepur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82b86c5b-d1bc-426a-b385-3ce35b779ba4/18569285081.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/005d45da-1f81-4c15-9346-84af96ca1174/saxigalowifibi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4a38e8c-6d5b-4c63-ad98-27f43329f699/povipovedewojowazonulif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e1d4266-9286-4eb0-ac7a-08cf0d56e636/nikobufujisatokum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c44c48c0-2a44-44c8-a344-d4f855af6942/96622201146.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1966/3522/files/13_reasons_why_season_3_episode_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/6963/1385/files/the_boy_in_the_striped_pajamas_multiple_choice_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a749c53-971e-4058-856a-a87203af4042/11483862112.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a966c9c3-81cb-40e0-9e65-093a5d418e78/gexonalene.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/wuwafugebilosa.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/mathematics_of_finance_petr_zima.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000083ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83CA 5288 bytes
SHA-256: d115f86b8a58699f7d8231ab8189bbe7d6ab88752146cfe78fef654cb7e557a1
font_01_sfnt_off000095b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95B5 9844 bytes
SHA-256: cc76f98865dd0723d340eaf930705a4eebc775b149097505ecd234baebc0629c

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