Malicious PDF — malware analysis report

Static analysis result for SHA-256 26bfb77429a9bad0…

MALICIOUS

PDF

51.5 KB Created: 2020-07-28 11:43:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 241cdbba47fae943c006f33332239d47 SHA-1: 5ee6e596cc7dc9e2db387a06a48ebc69e16870c9 SHA-256: 26bfb77429a9bad07700fd9f30149e76b7dd5ef6c4eb5eae59c72a92b6532e58
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. Additionally, a PDF SEO link farm heuristic indicates a large number of embedded links, many hosted on Shopify, likely used to obscure the malicious destination. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains text related to 'ctet form fill up', aligning with the redirector's keyword.

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=ctet+form+fill+up
    • http://files.drfujinaka.com/uploads/1/3/0/9/130969300/sixanolevorafav-xadawi-mexiterukuvid-xogadegeligiv.pdf
    • http://files.revemicroblading.com/uploads/1/3/2/7/132740723/fasebefazusugurapel.pdf
    • http://files.cmsoftware1.com/uploads/1/3/2/7/132740267/laxuxut.pdf
    • http://files.relationships4all.com/uploads/1/3/1/3/131381720/kodosozaribafu_ragiwufozemewik_fowulobenedimi_beruwuxosarif.pdf
    • http://files.socialinnovationfredericton.com/uploads/1/3/2/3/132303133/jaxibiroledesofogid.pdf
    • https://cdn.shopify.com/s/files/1/0434/6239/4008/files/94110863092.pdf
    • https://cdn.shopify.com/s/files/1/0430/1396/3939/files/87342767724.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gegexovikorojirokelaxedu.pdf
    • https://cdn.shopify.com/s/files/1/0437/0448/3993/files/givunowefonosojofofifofa.pdf
    • https://cdn.shopify.com/s/files/1/0436/2783/9641/files/4904298116.pdf
    • https://cdn.shopify.com/s/files/1/0433/6992/2714/files/poworuxegog.pdf
    • https://cdn.shopify.com/s/files/1/0439/3949/6094/files/bajoxitukuxukuzuna.pdf
    • https://cdn.shopify.com/s/files/1/0430/7959/8229/files/73799072328.pdf
    • https://cdn.shopify.com/s/files/1/0433/3951/4006/files/lasugujiganakizogitifep.pdf
    • https://cdn.shopify.com/s/files/1/0432/1335/7214/files/56516997252.pdf
    • https://cdn.shopify.com/s/files/1/0431/2249/1553/files/72711989688.pdf
    • https://cdn.shopify.com/s/files/1/0432/5654/5433/files/48305479655.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_off00008ebd.bin
dabe04b753a8d0275713c3f7d399c7f15dbaa611a9185bdd402809a21d2f5be2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EBD 4456 bytes
font_01_sfnt_off00009df1.bin
595ae479bc29758972a95ddfb4aaaabd3e2e74542f00f4e08ea3b227976974d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DF1 10220 bytes

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