Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1293cdbee011fb7…

MALICIOUS

PDF

39.0 KB Created: 2020-08-21 12:05:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad39c86ca58967e9e1440cb6dbeae4b7 SHA-1: dfdde5649b8e34d90772e18855f38e54dc8a1191 SHA-256: b1293cdbee011fb78c1d42f0e44489ed10a70eb84ab27072804490f3149a2666
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains a string that appears to be a URL related to 'iphone 11 live wallpaper', likely a lure. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning attempt to distribute malicious content. The ML classifier also strongly indicated maliciousness.

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=iphone+11+live+wallpaper
    • http://redom.ipksportsbetting.com/uploads/1/3/1/8/131857252/xulubafude_fowiwu_sowelorujigeb_kamagigo.pdf
    • http://files.educatepa.com/uploads/1/3/1/4/131438804/7356945.pdf
    • https://cdn.shopify.com/s/files/1/0435/4008/6935/files/70730313418.pdf
    • https://cdn.shopify.com/s/files/1/0435/9749/6488/files/cambridge_english_proficiency_practice_tests_mark_harrison.pdf
    • https://cdn.shopify.com/s/files/1/0430/9522/8565/files/pagud.pdf
    • https://cdn.shopify.com/s/files/1/0438/3119/7856/files/2020_awards_current_affairs.pdf
    • https://cdn.shopify.com/s/files/1/0445/6418/5247/files/wuxufogugeriga.pdf
    • https://cdn.shopify.com/s/files/1/0429/9853/0201/files/autodesk_sketchbook_app_2018.pdf
    • https://cdn.shopify.com/s/files/1/0454/3725/5838/files/shapes_worksheets_for_kg2.pdf
    • https://cdn.shopify.com/s/files/1/0431/2940/5600/files/welinoxoromuwutizefawole.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fofigez.pdf
    • https://cdn.shopify.com/s/files/1/0437/1375/7339/files/82487742346.pdf
    • https://cdn.shopify.com/s/files/1/0429/7729/6543/files/book_design_ideas.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_off00005d54.bin
09394dd698feef2896c29275c75b16e8220ecbc5681b250c4268ebccfa0c0414		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D54 4872 bytes
font_01_sfnt_off00006df0.bin
23697c158fd17e53d9171fa47b171e7d7ab36930b153caa2428bb57235180af5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DF0 9772 bytes

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