Malicious PDF — malware analysis report

Static analysis result for SHA-256 524c357e23d0cc6e…

MALICIOUS

PDF

45.0 KB Created: 2020-07-30 11:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c4484352707e701a8e9c84777404823 SHA-1: 8293b46c0030f45360462b397a0c1b1283afa617 SHA-256: 524c357e23d0cc6e6078c3211b2554cbe82eb83797b6cd779155351823f3d5b6
120 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with many links pointing to Shopify domains, likely for SEO manipulation. The primary malicious URL, 'https://ttraff.cc/pify?keyword=ielts+assessment+criteria+pdf', is a known malicious redirector. The document body is heavily obfuscated, preventing a clear understanding of its specific content beyond the metadata indicating it's related to IELTS assessment criteria. No scripts were extracted from this sample.

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.cc/pify?keyword=ielts+assessment+criteria+pdf
    • http://files.prometheanrebellion.com/uploads/1/3/1/4/131406275/7771441.pdf
    • http://files.summitventure.co/uploads/1/3/0/7/130739076/wewejufelinujij.pdf
    • http://files.royaleliterental.com/uploads/1/3/1/3/131398099/881656203dbd53.pdf
    • http://files.phdimensions.com/uploads/1/3/1/4/131454316/wopatesosarikuviko.pdf
    • http://files.mistywick.net/uploads/1/3/0/7/130776265/9acf3c.pdf
    • http://files.pr
    • https://cdn.shopify.com/s/files/1/0440/4926/8886/files/40547243853.pdf
    • https://cdn.shopify.com/s/files/1/0432/3396/8287/files/53495345493.pdf
    • https://cdn.shopify.com/s/files/1/0431/8652/0224/files/mixatubise.pdf
    • https://cdn.shopify.com/s/files/1/0429/8843/7655/files/ladaraxawilom.pdf
    • https://cdn.shopify.com/s/files/1/0432/9232/8104/files/73882148871.pdf
    • https://cdn.shopify.com/s/files/1/0430/3526/3130/files/movivurikuwobusokaxirijuw.pdf
    • https://cdn.shopify.com/s/files/1/0431/3631/9639/files/rikofoxarariviwajasugizer.pdf
    • https://cdn.shopify.com/s/files/1/0428/9894/8255/files/11030136506.pdf
    • https://cdn.shopify.com/s/files/1/0428/8688/9625/files/36532376446.pdf
    • https://cdn.shopify.com/s/files/1/0428/6365/7119/files/56967461540.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/peboginesewuxexadamo.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_off00007489.bin
d44cfdfdb88ed6d006fce8a717cc68693e4a02c633af2ed782778494b263e270		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7489 4916 bytes
font_01_sfnt_off00008513.bin
9d54497c327663bfe201aae33b877b51347c217393676670545c76a8bac61f27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8513 9780 bytes

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