Malicious PDF — malware analysis report

Static analysis result for SHA-256 099cccb2999977fe…

MALICIOUS

PDF

41.4 KB Created: 2020-08-09 01:29:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 233be1669b3b9c5cca257e416a8c7a78 SHA-1: f7d02c79cd0f977790d946bd9ec982de0eb04189 SHA-256: 099cccb2999977fee264cc43095bd65c05d26f2f276fa96fbc785ddaf1d714a6
162 Risk Score

Malware Insights

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

The PDF contains a lure related to 'curriculum mapping process pdf' and embeds numerous links, including one to a known malicious redirector. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm suggests an attempt to distribute malicious content or engage in SEO abuse. While no scripts were extracted, the embedded links and the invoice/payment lure heuristic indicate a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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.cc/pify?keyword=curriculum+mapping+process+pdf
    • http://files.boxofficesa.co.za/uploads/1/3/1/0/131070485/negadi_kusefateba_woburevatek.pdf
    • http://files.fionaharrisonmusic.com/uploads/1/3/0/9/130969034/filitixowojag.pdf
    • http://files.paynesculptures.com/uploads/1/3/1/4/131453406/2438784.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/0006/0310/files/gewafagadirirevipel.pdf
    • https://cdn.shopify.com/s/files/1/0435/9343/3246/files/67751894661.pdf
    • https://cdn.shopify.com/s/files/1/0428/7945/1295/files/nijopefabiv.pdf
    • https://cdn.shopify.com/s/files/1/0430/0642/7289/files/lurew.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78476378890.pdf
    • https://cdn.shopify.com/s/files/1/0434/5511/9512/files/90501149080.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/yard_bug_mowers.pdf
    • https://cdn.shopify.com/s/files/1/0431/4434/7802/files/jimesizaledoguvu.pdf
    • https://cdn.shopify.com/s/files/1/0428/5225/3863/files/xarenugilaxezuzobo.pdf
    • https://cdn.shopify.com/s/files/1/0438/4158/5314/files/determination_of_carbonate_and_bicarbonate_in_water_sample.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_off000063bd.bin
1bd6c0a5cb0cc122cd4d79fe44fd01c92860b377f338dd7e722c1542faf77daf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63BD 5380 bytes
font_01_sfnt_off000075ea.bin
a50f233db71f8a85a3c3418d7264c2840bac8b1327e51f4a7764a742ebcc3524		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75EA 10300 bytes

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