Malicious PDF — malware analysis report

Static analysis result for SHA-256 036d95d45c0420b1…

MALICIOUS

PDF

50.0 KB Created: 2020-08-05 23:18:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a23a65314fc3086c51eecf1e5956da2 SHA-1: aa34a4af4063271ed9bac4e21bf8ad7bb8800b68 SHA-256: 036d95d45c0420b1ca923dc5257fdd6b687033e698f6124abd653dce4d1c75a7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=celiac+disease+patient+education+pdf'. The document body, though heavily obfuscated, appears to contain references to educational material, suggesting a lure. The ML classifier strongly indicates maliciousness, and the presence of multiple external PDF links points towards a link farm or distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=celiac+disease+patient+education+pdf
    • http://binuro.miltonunitedmethodist.org/uploads/1/3/1/3/131381464/1d43b787.pdf
    • http://files.ingallsplanning.com/uploads/1/3/0/7/130776499/zazemidukajakebup.pdf
    • http://files.downtowngulfport.com/uploads/1/3/0/9/130969728/a2acf9b6dd30fd.pdf
    • http://files.oskfc.net/uploads/1/3/2/6/132695543/3641258.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/6021/4425/files/envision_math_grade_5.pdf
    • https://cdn.shopify.com/s/files/1/0429/9682/6273/files/80860116762.pdf
    • https://cdn.shopify.com/s/files/1/0432/9262/3001/files/mafumewori.pdf
    • https://cdn.shopify.com/s/files/1/0429/6556/5589/files/3409517088.pdf
    • https://cdn.shopify.com/s/files/1/0433/2866/7798/files/22943920057.pdf
    • https://cdn.shopify.com/s/files/1/0435/4798/4026/files/retelagasosazorodugobudem.pdf
    • https://cdn.shopify.com/s/files/1/0432/9055/8622/files/39054361762.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/27638317894.pdf
    • https://cdn.shopify.com/s/files/1/0439/2045/7883/files/airline_icao_codes.pdf
    • https://cdn.shopify.com/s/files/1/0437/6605/5063/files/zagexovozexevafa.pdf
    • https://cdn.shopify.com/s/files/1/0433/8899/3703/files/vineland_adaptive_behavior_scale.pdf
    • https://cdn.shopify.com/s/files/1/0434/3745/7575/files/55138776211.pdf
    • https://cdn.shopify.com/s/files/1/0431/5080/3099/files/94711161573.pdf
    • https://cdn.shopify.com/s/files/1/0428/3544/3875/files/88702163279.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000087d6.bin
e1b5f8682761dcc6fc8d18927dca8c0c0c2f899079a45231176f2f4824fffb86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87D6 4960 bytes
font_01_sfnt_off000098c6.bin
b5b19f9e576c419f3fbe960214bc9cd9632e526a265586bef691bda2d6c5d178		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98C6 9860 bytes

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