Malicious PDF — malware analysis report

Static analysis result for SHA-256 682c8fcd840f5312…

MALICIOUS

PDF

33.6 KB Created: 2020-08-04 11:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3477bd275a254c26d59fd897fffd3ba0 SHA-1: fea0c7106cc3dfe340a03fca10d7501d0c142325 SHA-256: 682c8fcd840f5312ae04fddd3a230df8cc2f4974fe43cccd13c68e93aa755301
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or redirection scheme. One prominent link, 'https://ttraff.cc/pify?keyword=agenda+mercantil+2020+pdf+descargar', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text related to an agenda and the tool used to create the PDF, reinforcing the lure. The presence of numerous links and the malicious redirector strongly indicate an attempt to lead users to malicious content.

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.cc/pify?keyword=agenda+mercantil+2020+pdf+descargar
    • http://bonelumo.tiasshabbychicboutique.com/uploads/1/3/2/8/132815002/vazaxujimirisigi.pdf
    • http://files.barrons-conferences.com/uploads/1/3/1/4/131409170/3066792.pdf
    • http://pemizenit.thecornerstohr.com/uploads/1/3/1/3/131379730/378fd17a810d1.pdf
    • http://files.sitesofpassage.org/uploads/1/3/2/7/132712096/gekavikilan.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vinujavezo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8803/5486/files/mokobuvifametegoxuwexole.pdf
    • https://cdn.shopify.com/s/files/1/0430/3834/3322/files/.pdf
    • https://cdn.shopify.com/s/files/1/0433/7857/3464/files/nizugawojuto.pdf
    • https://cdn.shopify.com/s/files/1/0433/9616/9886/files/s10_v8_conversion_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/5412/1635/files/17868714314.pdf
    • https://cdn.shopify.com/s/files/1/0431/1629/8393/files/asepsia_y_antisepsia_articulo.pdf
    • https://cdn.shopify.com/s/files/1/0434/0911/3253/files/online_picture_converter_to_jpg.pdf
    • https://cdn.shopify.com/s/files/1/0432/2656/2722/files/rurujagidureku.pdf
    • https://cdn.shopify.com/s/files/1/0434/2808/5912/files/94682938392.pdf
    • https://cdn.shopify.com/s/files/1/0437/4790/1592/files/61295326237.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/69440205977.pdf
    • https://cdn.shopify.com/s/files/1/0437/8719/0430/files/bodeladowujujo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pewobaropelizovijekozuji.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_off000044ec.bin
085f461e56c0cafedd557f6a120929c5cc96edf04b7304ef068609a787cab6bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x44EC 5740 bytes
font_01_sfnt_off00005862.bin
e8103542c834130de5a7fd79903ab57fbc9f834c598dca89caf4ef19c58b729a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5862 9724 bytes

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