Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9583b4821d60136…

MALICIOUS

PDF

47.0 KB Created: 2020-07-09 08:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd0dd5ee3c75396ec2840cfb2d6d04c6 SHA-1: 8c3cf7c24259a04dfd8ff45819cec255e8b0b199 SHA-256: b9583b4821d601367231cb679598818970046bf970a9ffe85431ecd48ea1ebf2
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, with one identified as a known malicious redirector. The heuristic firings indicate this is a PDF link farm designed to host numerous external links. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves luring users to click on these links, which likely lead to phishing pages or malware downloads.

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/wb?keyword=parts%20of%20ms%20word%202016%20pdf
    • http://files.byyoursidecounselling.co.uk/uploads/1/3/0/9/130969437/545349.pdf
    • http://files.colleenkelseyart.com/uploads/1/3/0/7/130739063/d3bdce9b84bda32.pdf
    • http://files.wealthbeyondwords.org/uploads/1/3/1/0/131070481/5545297.pdf
    • http://files.dontcrampourstyle.com/uploads/1/3/1/4/131407665/lemefemidunu-kemefol-sosebetanumir-xojerogibos.pdf
    • http://files.milehighaussies.com/uploads/1/3/0/8/130874458/zitim.pdf
    • http://files.ashleysandersonphotography.com/uploads/1/3/2/7/132740256/7877936.pdf
    • http://files.iamrobthomas.com/uploads/1/3/2/6/132695195/favepoto.pdf
    • http://files.riverdaleridge.com/uploads/1/3/0/7/130775744/94bdb8.pdf
    • http://files.priorityenvironmental.ca/uploads/1/3/2/7/132740415/poturowinu-pepurefeme-zomoxiru.pdf
    • http://files.limassolsportsmassage.com/uploads/1/3/0/8/130874129/laxuvovobopekidom.pdf
    • http://files.neylandancer.com/uploads/1/3/2/6/132695896/56991b.pdf
    • https://togapona.files.wordpress.com/2020/07/buzelapesekizuzepejil.pdf
    • https://ribesed.files.wordpress.com/2020/06/buvano.pdf
    • https://sikolerekawa.files.wordpress.com/2020/06/78868692092.pdf
    • https://molijokito.files.wordpress.com/2020/06/57562845491.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kuvesagapixunijibofalase.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kewosa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nasodidupafulad.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sakemiribukewud.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_off00007b38.bin
51aa0bd0b702204d17b61a4bfea43a8f20af7d7166037aba7bb3b8c17df97ad6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B38 5244 bytes
font_01_sfnt_off00008d0f.bin
9d0493332f4daa0659ecf93ce712b3aca2202c50c22f4d81a98f3fdfa14e5edd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D0F 10080 bytes

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