Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ec2dce08a9c32b…

MALICIOUS

PDF

47.1 KB Created: 2020-08-10 10:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3135c932cdd4f2bccf9f4c961a8dd411 SHA-1: e3ed6d58e62000d99a663c8812a6d3a8b09e76a4 SHA-256: 21ec2dce08a9c32b40b556a04e23c0249de86d947178ba3f374ee0b75c67709c
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains numerous URLs, including a primary suspicious URL pointing to a redirector service. The presence of a large number of embedded links suggests an attempt to lure users to external, potentially malicious, sites.

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=editorials+of+the+hindu+pdf
    • http://vevelubo.trikaroo.com/uploads/1/3/0/8/130874330/rajexijuxopozo.pdf
    • http://files.ddsdelightsonline.com/uploads/1/3/1/1/131164350/vagam.pdf
    • http://files.greeceadventuretrips.com/uploads/1/3/0/8/130814460/sasilik.pdf
    • http://files.grandvilleorchestra.com/uploads/1/3/1/4/131409761/tedezonavavuwe.pdf
    • https://cdn.shopify.com/s/files/1/0430/8035/1897/files/playboy_free.pdf
    • https://cdn.shopify.com/s/files/1/0436/8846/0441/files/wisewobes.pdf
    • https://cdn.shopify.com/s/files/1/0429/5750/4668/files/22557165727.pdf
    • https://cdn.shopify.com/s/files/1/0435/2661/9287/files/xirepekulaxu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0056/0805/files/39934840419.pdf
    • https://cdn.shopify.com/s/files/1/0434/8212/0358/files/sudovezopobawawulinud.pdf
    • https://cdn.shopify.com/s/files/1/0429/3279/7607/files/gazopeziranonugupidu.pdf
    • https://cdn.shopify.com/s/files/1/0429/0864/7580/files/94596901345.pdf
    • https://cdn.shopify.com/s/files/1/0435/7075/7795/files/36032232816.pdf
    • https://cdn.shopify.com/s/files/1/0433/5288/3352/files/60291006270.pdf
    • https://cdn.shopify.com/s/files/1/0440/6879/8614/files/71463300360.pdf
    • https://cdn.shopify.com/s/files/1/0429/7618/2426/files/rezilitesabokobegepun.pdf
    • https://cdn.shopify.com/s/files/1/0439/0882/5256/files/10514054074.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007085.bin
eec2311198495a4bc353016469730966835d49679daeed18a98faa9ab15954d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7085 2828 bytes
font_01_sfnt_off00007a8f.bin
e67f597d71c3dd558c2cd24f286fd833c83a118d59c8cdeefc16b497f94cef64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A8F 5088 bytes
font_02_sfnt_off00008bd8.bin
95d30081821744f063ed7245cfa0f86b602de334be8f4d76026ca1dfb6b5c79b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BD8 10340 bytes

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