Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a2ae8154bc28f59…

MALICIOUS

PDF

45.0 KB Created: 2020-08-10 10:05:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c90df6f42eb05f1ebafba06a9dcac58f SHA-1: 795959e01ef5f4fb2004d054c593eebf503890ef SHA-256: 2a2ae8154bc28f59947c079890683d811bb516dbe279e49b8b5cdd7cecf8c0f7
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.003 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of the primary links, 'https://ttraff.cc/pify?keyword=fusionner+plusieurs+fichier+pdf+en+un+seul', is identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to merging PDF files, suggesting a social engineering pretext. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful content.

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.cc/pify?keyword=fusionner+plusieurs+fichier+pdf+en+un+seul
    • http://files.brickhouseantiquestopeka.com/uploads/1/3/2/3/132303314/e01e9e8.pdf
    • http://files.vomifix.com/uploads/1/3/1/6/131637484/7544076.pdf
    • http://files.elliot-design.co.uk/uploads/1/3/1/3/131398231/nuridesawup.pdf
    • http://files.clear-heater.co.uk/uploads/1/3/1/3/131384098/mosar-bodaka-fafedi.pdf
    • http://files.bravotouch1.com/uploads/1/3/0/7/130775633/7988682.pdf
    • https://cdn.shopify.com/s/files/1/0437/7093/7498/files/teseer_abwab_us_sarf.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/48754972600.pdf
    • https://cdn.shopify.com/s/files/1/0428/9472/1187/files/puwivafafiwigizinol.pdf
    • https://cdn.shopify.com/s/files/1/0428/4533/9814/files/digigovudut.pdf
    • https://cdn.shopify.com/s/files/1/0431/9058/3458/files/takunejozejewi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/28650507632.pdf
    • https://cdn.shopify.com/s/files/1/0434/1019/4582/files/diromimugasogatigud.pdf
    • https://cdn.shopify.com/s/files/1/0430/4073/5381/files/vavuvuzositifusobim.pdf
    • https://cdn.shopify.com/s/files/1/0435/9746/3714/files/anatomia_czowieka_bochenek_chomikuj.pdf
    • https://cdn.shopify.com/s/files/1/0433/7513/2824/files/71723271143.pdf
    • https://cdn.shopify.com/s/files/1/0435/5280/0920/files/kexezujarumejife.pdf
    • https://cdn.shopify.com/s/files/1/0431/4939/4080/files/how_to_convert_blob_to_file_in_java.pdf
    • https://cdn.shopify.com/s/files/1/0444/8436/2407/files/automobile_technology_nk_giri.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_off000061f9.bin
daeb79f8966e2e15f473c405578ac94ee847523f33c47d9a5b395aec103da54f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61F9 4792 bytes
font_01_sfnt_off0000722a.bin
91f58d4c806d288f7b973e7520ef1a80b4122ec1ea36ffad41abd0087365e727		 pdf-font-stream PDF embedded font (sfnt) at offset 0x722A 11636 bytes
font_02_sfnt_off000096a2.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96A2 4324 bytes

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