Malicious PDF — malware analysis report

Static analysis result for SHA-256 31ce298cf3b434ab…

MALICIOUS

PDF

47.1 KB Created: 2020-07-21 09:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb26f2ec39058204469a55f3da9c7f50 SHA-1: d2747ee05994b9b6f48822271079092754539bf2 SHA-256: 31ce298cf3b434ab6c0396e0d03da221e31f8bef2811a5d724571f249eb0b09e
152 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with one specifically identified as a known malicious redirector. This redirector likely serves as a gateway to a malicious site. The ML classifier also strongly indicated maliciousness. The presence of numerous external links, including a link farm, suggests an attempt to manipulate search engine results or distribute content through various means. No scripts were extracted, but the primary malicious activity appears to be redirection to external malicious infrastructure.

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=chores%20by%20age%20pdf
    • http://files.angelahollanddesigns.com/uploads/1/3/1/4/131453924/3253511.pdf
    • http://files.tobymusgrave.com/uploads/1/3/1/4/131454255/5009452.pdf
    • http://files.motionautodetailing.net/uploads/1/3/1/4/131407625/8093600.pdf
    • http://files.arvidkappas.com/uploads/1/3/0/7/130738751/pipuxuk.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/41267837863.pdf
    • https://cdn.shopify.com/s/files/1/0430/8946/1402/files/78832327491.pdf
    • https://cdn.shopify.com/s/files/1/0430/0141/3795/files/deguxiwibazejazewedom.pdf
    • https://cdn.shopify.com/s/files/1/0437/0635/1771/files/32631782305.pdf
    • https://pimuzuvaduz.files.wordpress.com/2020/06/12022025072.pdf
    • https://vudesepof.files.wordpress.com/2020/07/boxidesijotese.pdf
    • https://kegores.files.wordpress.com/2020/06/lizajepikodizag.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/ligumugazawebamupewav.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/86533366095.pdf
    • https://cdn.shopify.com/s/files/1/0430/0252/7897/files/xuwit.pdf
    • https://cdn.shopify.com/s/files/1/0429/8221/1735/files/21590489198.pdf
    • https://cdn.shopify.com/s/files/1/0429/4557/7116/files/27753847693.pdf
    • https://cdn.shopify.com/s/files/1/0430/7409/3217/files/pegufoxamufawiku.pdf
    • https://cdn.shopify.com/s/files/1/0437/1313/4757/files/94915375770.pdf
    • https://cdn.shopify.com/s/files/1/0433/0576/2974/files/93067341126.pdf
    • https://cdn.shopify.com/s/files/1/0431/8475/0743/files/rosuxinazajetagu.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/
    • https://cdn.shopify.com/s/files/1/0437/0635/1

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007c42.bin
2c5e38e154b0788885dea420dfabfeb8bbc0b7bda984f37e40655aa9ae5410f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C42 5088 bytes
font_01_sfnt_off00008d9e.bin
15c2492f9f21a8f237e3fa0ad788381f9d9d9fcf102f2adb8e51d03050f6dbd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D9E 10024 bytes

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