Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4043210250f51e4…

MALICIOUS

PDF

43.5 KB Created: 2020-08-14 09:52:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe9124547caaa847eb5e4d8d6c5fed9f SHA-1: 64de2e7c20b5490b6a8c70036ee10e1fb8aa0dd4 SHA-256: b4043210250f51e40a0fb897bed73303dabfb4dfadeface6c272fb628d1a1d0e
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The document body, though heavily obfuscated, contains text related to 'free time activities flashcards pdf' and the malicious URL itself. This suggests the document is designed to trick users into clicking the malicious link, likely leading to further compromise.

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/wb?keyword=free%20time%20activities%20flashcards%20pdf
    • http://files.nathanalandavis.com/uploads/1/3/1/4/131407552/1704144.pdf
    • http://files.counterpoint-journal.com/uploads/1/3/1/3/131398515/2576e7abec64f.pdf
    • http://files.justacatlover.com/uploads/1/3/0/7/130775427/0249150.pdf
    • http://files.neelsels.com/uploads/1/3/1/3/131398475/c05fd41fcdc4.pdf
    • https://cdn.shopify.com/s/files/1/0436/1843/5229/files/orphan_2009_cast.pdf
    • https://cdn.shopify.com/s/files/1/0430/7353/6161/files/81537273246.pdf
    • https://cdn.shopify.com/s/files/1/0430/8946/1410/files/xosuv.pdf
    • https://cdn.shopify.com/s/files/1/0434/9722/6402/files/68540485543.pdf
    • https://cdn.shopify.com/s/files/1/0431/0990/8637/files/sistem_informasi_akademik_unsri._ac._id.pdf
    • https://cdn.shopify.com/s/files/1/0429/8221/1733/files/mupavobawola.pdf
    • https://cdn.shopify.com/s/files/1/0431/1502/0448/files/vokizagexolibotevojo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2738/1920/files/70774375508.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mekokagowofulagifofid.pdf
    • https://cdn.shopify.com/s/files/1/0437/3997/1738/files/albert_bandura_self_efficacy.pdf
    • https://cdn.shopify.com/s/files/1/0431/7118/4794/files/luzategifubelejuxe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005733.bin
e2ba0a87b16ab3fa405fe4d3aabc6f39b9893f2b7f689b3ec0cc1bd55117a706		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5733 5408 bytes
font_01_sfnt_off00006972.bin
ad4f35c040ade8ffb16cf95a559b17fbb787eff1ba153d01d265472f292d313e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6972 9996 bytes
font_02_sfnt_off00008bed.bin
71727a5f61945565ba925525dc5e97fc15060b6b47aecd4c775f73df5581ac1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BED 16108 bytes

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