Malicious PDF — malware analysis report

Static analysis result for SHA-256 e39d2f09beda9db2…

MALICIOUS

PDF

73.7 KB Created: 2020-08-09 01:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 75b884990ed440c7d8eb7dad928a6cfa SHA-1: bfba642e81f7150e44d80d79829d0067ed80a453 SHA-256: e39d2f09beda9db2d34ffae825f1012b319c81d8cf20495e38f7f2761cc854e6
120 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many hosted on Shopify. The document body, though heavily obfuscated, contains references to 'Cebuano grammar pdf' and the wkhtmltopdf tool, suggesting a lure to disguise malicious content. The primary malicious IOC is the redirector URL.

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=cebuano+grammar+pdf
    • http://files.thejoyfueledteacher.com/uploads/1/3/2/7/132740905/texanuko.pdf
    • http://files.rhccfd.org/uploads/1/3/0/9/130969580/mogawenoxorudodijug.pdf
    • http://sejofo.client-minder.com/uploads/1/3/1/4/131438177/bumivixe-dewedi-zubogate-werejokepe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/78992801071.pdf
    • https://cdn.shopify.com/s/files/1/0429/2971/7407/files/mifoxofik.pdf
    • https://cdn.shopify.com/s/files/1/0433/8489/7701/files/10336544702.pdf
    • https://cdn.shopify.com/s/files/1/0430/5803/6889/files/xanumepudizimamejatap.pdf
    • https://cdn.shopify.com/s/files/1/0432/6536/0034/files/25260199181.pdf
    • https://cdn.shopify.com/s/files/1/0429/8512/8095/files/satatelulepigariwezoluri.pdf
    • https://cdn.shopify.com/s/files/1/0431/5552/1700/files/estadistica_descriptiva_ejercicios.pdf
    • https://cdn.shopify.com/s/files/1/0430/6426/2818/files/how_to_create_a_book_using_files.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/79157206586.pdf
    • https://cdn.shopify.com/s/files/1/0431/0709/0589/files/wavuzidosutalasosutop.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_off0000db1d.bin
3d16e57c01b5d5bd353f0f56a4193d909d8a3fdf7a351e96607d011bc83e1960		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1D 5196 bytes
font_01_sfnt_off0000ecab.bin
cbf1db509f9a473e995507f25aab595d3205f480f7f9ad091ea84f8fc0ca1567		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECAB 14724 bytes

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