Malicious PDF — malware analysis report

Static analysis result for SHA-256 dae16aa2a30e70a4…

MALICIOUS

PDF

39.9 KB Created: 2020-08-18 15:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 47b66f2f54ebd2ce2e2ff71e53b45114 SHA-1: 76a8aa4e9acac7f91fc2d4a2e6906f838bec5524 SHA-256: dae16aa2a30e70a4daf84eda30bc96687a40b0caf5134de7ee9d22e9efbff5c4
120 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=unhide+sheet+in+excel+online'. This URL is embedded within the document body, disguised as a guide for unhiding Excel sheets. The document also exhibits characteristics of a link farm, with numerous embedded URLs, many hosted on Shopify, likely for SEO manipulation or to obscure the malicious redirector. No scripts were extracted, and the document body itself is heavily obfuscated, but the primary intent appears to be redirecting the user to malicious infrastructure.

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=unhide+sheet+in+excel+online
    • http://fonobo.guyswoodshop.com/uploads/1/3/2/3/132302780/3258380.pdf
    • http://files.yefeart.com/uploads/1/3/1/6/131606392/36729f9.pdf
    • https://cdn.shopify.com/s/files/1/0439/1406/8123/files/monujefevi.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/mamabowo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2174/5822/files/34534547861.pdf
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/rexoguwovaz.pdf
    • https://cdn.shopify.com/s/files/1/0430/6819/4965/files/safujesogaw.pdf
    • https://cdn.shopify.com/s/files/1/0430/5122/1146/files/galenutitezufizawi.pdf
    • https://cdn.shopify.com/s/files/1/0427/8134/3900/files/79469005411.pdf
    • https://cdn.shopify.com/s/files/1/0427/9051/8940/files/sadegijekamagesetim.pdf
    • https://cdn.shopify.com/s/files/1/0433/1172/6750/files/46615458100.pdf
    • https://cdn.shopify.com/s/files/1/0437/7106/8577/files/ncert_english_grammar_book_for_class_5.pdf
    • https://cdn.shopify.com/s/files/1/0437/0500/8293/files/jukinapupupirireb.pdf
    • https://cdn.shopify.com/s/files/1/0432/0660/7012/files/66620089016.pdf
    • https://cdn.shopify.com/s/files/1/0434/2883/9581/files/17441310969.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_off0000610c.bin
ef8c024ba3c307c6a832c03e8e9ac736ceedca399d558b2e13fdda672bcf689e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x610C 4780 bytes
font_01_sfnt_off0000714b.bin
f5bbd3834217d02799c4044ec4aefe2b8c6e85b467b3ddcb8383fa5f208b2a56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x714B 9828 bytes

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