Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8a8ae830c57bc9d…

MALICIOUS

PDF

41.5 KB Created: 2020-08-14 17:34:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cae9fae4d9fbeb01d01a504ba41d2032 SHA-1: e146d9ed6186d8b11f8e3b157ab0c8c0fe4b200e SHA-256: e8a8ae830c57bc9def6820b31e1d200104d535e222cc34648334bf54e8e56f80
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass of external links, including a critical link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=anarchy+linux+guide'. This suggests the document is designed to lead users to malicious infrastructure, likely for further exploitation or credential harvesting. The ML classifier strongly supports the malicious nature of this PDF.

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.ru/pify?keyword=anarchy+linux+guide
    • http://files.susannahcorrington.com/uploads/1/3/1/1/131163976/7298644.pdf
    • http://files.525pathfinder.com/uploads/1/3/0/8/130874246/6363319.pdf
    • https://cdn.shopify.com/s/files/1/0437/0432/0154/files/kapununo.pdf
    • https://cdn.shopify.com/s/files/1/0437/0441/8459/files/encyclopdie_universalis_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/2433/4498/files/60444777225.pdf
    • https://cdn.shopify.com/s/files/1/0434/3939/0872/files/.pdf
    • https://cdn.shopify.com/s/files/1/0434/6285/2773/files/nerodupijo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6296/0023/files/xenowowuponasa.pdf
    • https://cdn.shopify.com/s/files/1/0443/0426/9468/files/adobe_photoshop_lightroom_64_bit.pdf
    • https://cdn.shopify.com/s/files/1/0429/8624/2209/files/4141529669.pdf
    • https://cdn.shopify.com/s/files/1/0429/1824/8601/files/60924510123.pdf
    • https://cdn.shopify.com/s/files/1/0431/9969/2958/files/toxekuxosojodesuxisesope.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065b0.bin
5ed28b61947cefedf1f49e23ad378becc460b3b8148014d070496ea41fa3bd0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65B0 5180 bytes
font_01_sfnt_off00007743.bin
4447af763de8774e0c946035d572b1c24041678a824bdf671bb02966e133889d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7743 10120 bytes

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