Malicious PDF — malware analysis report

Static analysis result for SHA-256 74a9ce97a6cf7c53…

MALICIOUS

PDF

46.7 KB Created: 2020-08-15 00:24:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa9b4f07f917442b30129a9f993de41c SHA-1: ca5002f47bae98b8208b434078d9d3ade5f011ca SHA-256: 74a9ce97a6cf7c5388269f6434a40f1a2f7838131b89bc442b951f98d953378c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=bruner+toward+a+theory+of+instruction+pdf'. The document body, though heavily obfuscated, also contains this URL and other links to PDF files hosted on Shopify, suggesting a link farm or content stuffing technique to mask malicious activity. The ML classifier also strongly indicated maliciousness.

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=bruner+toward+a+theory+of+instruction+pdf
    • http://xekom.charlenevanbuiten.com/uploads/1/3/0/8/130813528/mozive-diporujisimo.pdf
    • http://files.fathomworx.com/uploads/1/3/0/9/130969887/d13a310b25.pdf
    • http://files.gleisinc.com/uploads/1/3/1/6/131637482/jenoda.pdf
    • http://files.lambdasigmaphi.org/uploads/1/3/0/8/130814342/rutaromazuses-wolewafes.pdf
    • http://pozeboli.jonathangillespie.net/uploads/1/3/0/8/130874379/1176941.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/1187/3688/files/37481420638.pdf
    • https://cdn.shopify.com/s/files/1/0431/8117/9048/files/14073984766.pdf
    • https://cdn.shopify.com/s/files/1/0430/9437/6599/files/gawamokabijojuxikokibovo.pdf
    • https://cdn.shopify.com/s/files/1/0430/8838/0061/files/wevoben.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bewasovenajuwawofitef.pdf
    • https://cdn.shopify.com/s/files/1/0434/7074/9861/files/3134147735.pdf
    • https://cdn.shopify.com/s/files/1/0428/8544/7833/files/girasivoxakijijeso.pdf
    • https://cdn.shopify.com/s/files/1/0429/2883/2675/files/bumunotamivovajizovokut.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zorugeligix.pdf
    • https://cdn.shopify.com/s/files/1/0431/8353/8331/files/56291775985.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/21884581804.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006bf4.bin
472b72e413d5112d2ee7f51e0d542f4d2af52cbe8201a028b58aa62a4ec58872		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BF4 5336 bytes
font_01_sfnt_off00007e28.bin
710b039c39d1b9d84f9911d9e85d61d2d9050674f3c73e5c5bdff810debe760b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E28 9716 bytes
font_02_sfnt_off00009f56.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F56 4324 bytes

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