Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab509c2ca2e0b3e9…

MALICIOUS

PDF

43.9 KB Created: 2020-08-08 09:43:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 97262ef42b3e3ef10d82e887264f3cdf SHA-1: bf15e65acd321c52fc2d900659ff2dd8271ccecf SHA-256: ab509c2ca2e0b3e96dec639be6f894da7a33a2fc7d941fc8472ea43e7951a158
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the target URL, suggesting a lure to download a PDF. The presence of multiple Shopify URLs and other file-hosting domains indicates a link farm strategy to obscure the malicious destination. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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=relationship+between+attitude+and+behaviour+pdf
    • http://files.barbaralyons.net/uploads/1/3/1/1/131164114/7040810.pdf
    • http://leravu.mountaintrafficcircle.com/uploads/1/3/0/8/130874254/bogav_dorerakafenow_savutagoferud_tokexi.pdf
    • http://files.msmaco.com/uploads/1/3/1/3/131380440/guxupewuraba.pdf
    • https://cdn.shopify.com/s/files/1/0434/8300/5078/files/48852175051.pdf
    • https://cdn.shopify.com/s/files/1/0439/5106/3195/files/how_to_rotate_iphone_video.pdf
    • https://cdn.shopify.com/s/files/1/0437/9528/4130/files/xajonozukesari.pdf
    • https://cdn.shopify.com/s/files/1/0436/5035/1257/files/vw_bentley_manual.pdf
    • https://cdn.shopify.com/s/files/1/0427/7937/7830/files/b._com_sem_3_books_gujarati_medium.pdf
    • https://cdn.shopify.com/s/files/1/0432/2682/4863/files/12572977471.pdf
    • https://cdn.shopify.com/s/files/1/0431/1692/0996/files/vukazekedanuwelesuge.pdf
    • https://cdn.shopify.com/s/files/1/0436/6696/4630/files/33668117516.pdf
    • https://cdn.shopify.com/s/files/1/0432/2073/0020/files/21729578109.pdf
    • https://cdn.shopify.com/s/files/1/0432/0631/2098/files/suny_albany_transcript.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_off00006d04.bin
9e017145d83e456f649b69e4081077125fea3ba78a3a32c32c04261824890c35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D04 5428 bytes
font_01_sfnt_off00007f88.bin
bb918337378f750018501f64f7f0f6a85ed56a70d5428ef312dfd5df8ce420e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F88 10212 bytes

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