Malicious PDF — malware analysis report

Static analysis result for SHA-256 1845b3d8fa76f384…

MALICIOUS

PDF

34.8 KB Created: 2020-08-27 21:42:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f76f3694e37982ad9c7f94cce7c8069 SHA-1: 25da9a0d17ca725ad217841b5f9281312e66029e SHA-256: 1845b3d8fa76f38436e5273ab9d8c35b0a27211b036145ed33ad5a8a07a464a9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'Cvs near upenn' and a URL that appears to be part of a link farm designed to drive traffic to potentially malicious sites. The ML classifier strongly indicated maliciousness, supporting the presence of malicious redirector links.

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=cvs+near+upenn
    • http://files.farmhousefixer.com/uploads/1/3/1/1/131164324/sotedonazelesidox.pdf
    • http://sixile.sandringhamgolfclub.org.au/uploads/1/3/0/7/130775732/vuzobanovute.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/3695/8106/files/admin_dashboard_theme_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/6012/4065/files/nuwixuzojumumobinejobow.pdf
    • https://cdn.shopify.com/s/files/1/0431/1531/5351/files/pixobujaragudavozaroviko.pdf
    • https://cdn.shopify.com/s/files/1/0433/9607/1578/files/fugov.pdf
    • https://cdn.shopify.com/s/files/1/0428/5222/1091/files/kotedaxukejexadozotudox.pdf
    • https://cdn.shopify.com/s/files/1/0429/6087/9772/files/akkadian_language_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0432/6631/0299/files/pokemon_leaf_green_walkthrough.pdf
    • https://cdn.shopify.com/s/files/1/0427/9068/2783/files/yamang_tao_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mozesuseb.pdf
    • https://cdn.shopify.com/s/files/1/0431/5312/9640/files/liragenudevomeva.pdf
    • https://cdn.shopify.com/s/files/1/0434/6318/0438/files/anatomy_of_human_stomach.pdf
    • https://cdn.shopify.com/s/files/1/0429/1146/5631/files/88214650171.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_off00004aea.bin
da09a572160354929e299f1b1ec4f99e15d699d492432e5a37f60de69400f34b
pdf-font-stream PDF embedded font (sfnt) at offset 0x4AEA 4748 bytes
font_01_sfnt_off00005b20.bin
8f3af62cbaea12b99349697f3225ebfb3a8cce96ad1b4b4036b0af82710aab49
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B20 10464 bytes