Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab2fc2d9c1679b23…

MALICIOUS

PDF

48.0 KB Created: 2020-10-26 05:25:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4ef8e7e3920578d9342eefcf910fd9ad SHA-1: d08e4a3828987553c4129c389192996a8bac1b81 SHA-256: ab2fc2d9c1679b23d29ccffcfafee29f3ae4d1cbe2b867e72e5c013b95623a01
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for redirector link infrastructure. It contains a large number of embedded links pointing to external PDF files, suggesting a link farm or SEO spam campaign. One of the embedded URLs, https://cctraff.ru/strik?keyword=la+sintaxis+de+la+imagen+resumen+cap, is identified as a known malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://cctraff.ru/strik?keyword=la+sintaxis+de+la+imagen+resumen+cap
    • https://cdn-cms.f-static.net/uploads/4366309/normal_5f8ceaf4cbfab.pdf
    • https://cdn-cms.f-static.net/uploads/4368250/normal_5f888a3c8a0df.pdf
    • https://cdn-cms.f-static.net/uploads/4369656/normal_5f8de65c96aee.pdf
    • https://cdn-cms.f-static.net/uploads/4366357/normal_5f875a49662ab.pdf
    • https://cdn-cms.f-static.net/uploads/4366045/normal_5f86f86cd36ef.pdf
    • https://cdn-cms.f-static.net/uploads/4380882/normal_5f8b63aa232b6.pdf
    • https://cdn-cms.f-static.net/uploads/4368952/normal_5f8a329ba22aa.pdf
    • https://cdn-cms.f-static.net/uploads/4384639/normal_5f963aede3522.pdf
    • https://cdn-cms.f-static.net/uploads/4369914/normal_5f8a276260f8c.pdf
    • https://cdn-cms.f-static.net/uploads/4368249/normal_5f935b98987a4.pdf
    • https://cdn-cms.f-static.net/uploads/4383806/normal_5f8e1be8dd9d8.pdf
    • https://cdn-cms.f-static.net/uploads/4381980/normal_5f95fc5d77fb2.pdf
    • https://cdn-cms.f-static.net/uploads/4403404/normal_5f942153ee41e.pdf
    • https://cdn-cms.f-static.net/uploads/4366401/normal_5f8715e59c413.pdf
    • https://cdn-cms.f-static.net/uploads/4384464/normal_5f8d2c3fd329d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3c977b83-8514-436a-9b72-b4c46ce3ead0/89876215773.pdf
    • https://uploads.strikinglycdn.com/files/ae6036cc-eeb8-4ac7-b280-63cb8bdc6b1c/luziwajemewoliwef.pdf
    • https://uploads.strikinglycdn.com/files/890ab9fd-d612-44f6-8d47-c4d9d0a9d10d/16420594297.pdf
    • https://uploads.strikinglycdn.com/files/09daaef3-d40f-4960-bac0-6c16f083caf2/barasapilalekezekapoforum.pdf
    • https://cdn.shopify.com/s/files/1/0483/2313/3604/files/curse_of_blackmoor_manor_zodiac_puzzle.pdf
    • https://cdn.shopify.com/s/files/1/0432/9550/6592/files/photo_translator_text_scanner_apk.pdf
    • https://cdn.shopify.com/s/files/1/0438/1684/5469/files/43942333153.pdf
    • https://cdn.shopify.com/s/files/1/0499/7749/1618/files/lathe_machine_parts_and_function.pdf
    • https://cdn.shopify.com/s/files/1/0497/2894/6351/files/neufert_architects_data_4th_edition_book.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008a98.bin
1947cce1970acfa33fb164793dd9e1b73b971444f3daef5ed1144e865c89ad4a
pdf-font-stream PDF embedded font (sfnt) at offset 0x8A98 5404 bytes
font_01_sfnt_off00009cde.bin
b3f4c9349fc8e6901117edc7f6aac5c44a710ca55657f13a4e412fa358a13333
pdf-font-stream PDF embedded font (sfnt) at offset 0x9CDE 11056 bytes