Malicious PDF — malware analysis report

Static analysis result for SHA-256 261d898e31e9bd82…

MALICIOUS

PDF

35.8 KB Created: 2020-08-20 05:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 62852e684571726cd66a099e52362468 SHA-1: f30b20de658f17bf32af9597a9147a16e1a9a4e5 SHA-256: 261d898e31e9bd824cad44d73877fe2d13fa4017ae6a798cf043a24c80061e63
120 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be the same as the malicious redirector. This suggests the document's primary purpose is to trick users into visiting a malicious website by presenting it as an educational resource.

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.com/pify?keyword=negative+numbers+worksheet+ks2
    • http://vunoxub.jasdjorep.org/uploads/1/3/0/7/130738854/2964606.pdf
    • http://wegesi.sharpeningonsite.com/uploads/1/3/0/7/130776334/senodufezo_revalu.pdf
    • http://files.wichcream.com/uploads/1/3/2/6/132683330/7104014.pdf
    • https://cdn.shopify.com/s/files/1/0437/5012/9813/files/nulejaje.pdf
    • https://cdn.shopify.com/s/files/1/0433/8765/0211/files/rslogix_download_with_serial_key.pdf
    • https://cdn.shopify.com/s/files/1/0429/7038/2490/files/nalupofomud.pdf
    • https://cdn.shopify.com/s/files/1/0431/6499/1649/files/american_english_punctuation_rules.pdf
    • https://cdn.shopify.com/s/files/1/0433/5930/5880/files/94814536522.pdf
    • https://cdn.shopify.com/s/files/1/0433/0982/6213/files/99696710752.pdf
    • https://cdn.shopify.com/s/files/1/0439/4627/9080/files/install_tmux_mac.pdf
    • https://cdn.shopify.com/s/files/1/0434/1507/7022/files/khachaturian_sabre_dance.pdf
    • https://cdn.shopify.com/s/files/1/0435/2868/3674/files/bandook_chalegi_video.pdf
    • https://cdn.shopify.com/s/files/1/0434/3015/0296/files/27634765034.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_off00004e81.bin
309726260edb1fae9ccf627e5f7e666a7b0bbb3d323d2f632d321500ad4c6508		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E81 5524 bytes
font_01_sfnt_off0000613c.bin
90ff25569bdbc26367ef8953b50fcd52c50506d76305f12e7cb8490f3463fd82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x613C 9784 bytes

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