Malicious PDF — malware analysis report

Static analysis result for SHA-256 28c473b87525de58…

MALICIOUS

PDF

41.1 KB Created: 2020-08-17 16:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 082028e473b9faa15e1293add89c9f2a SHA-1: cb41cb62314601f633cb49dd16f1f48d8100a801 SHA-256: 28c473b87525de5840582e0ec8dde4fab5ea9fcd5bad5764aaa0616f755a0d5f
152 Risk Score

Malware Insights

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

The PDF contains a prominent link disguised as an academic resource, which is a common lure for phishing attacks. The link redirects to a malicious URL (https://ttraff.cc/pify?keyword=academic+listening+test+4+answer), indicating a redirection chain to potentially harmful content. The presence of numerous other PDF links, many hosted on Shopify, suggests a link farm or content distribution network used to obscure the final destination.

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=academic+listening+test+4+answer
    • http://mulal.timeundertensionwellness.com/uploads/1/3/1/4/131482952/wosina-dogukovomu.pdf
    • http://files.davidswinston.com/uploads/1/3/1/3/131398278/031818a356a54.pdf
    • http://files.herbal-thymes.com/uploads/1/3/1/4/131454172/8ad63f06d.pdf
    • http://files.edengardenandpets.com/uploads/1/3/1/8/131857315/6994202.pdf
    • http://files.springphysio.co.uk/uploads/1/3/0/8/130813906/3813450.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/97253363073.pdf
    • https://cdn.shopify.com/s/files/1/0434/8434/8569/files/mimotojonewowulogojazik.pdf
    • https://cdn.shopify.com/s/files/1/0432/4573/2007/files/24138510976.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/application_of_mathematics_in_civil_engineering.pdf
    • https://cdn.shopify.com/s/files/1/0432/3265/7568/files/voleg.pdf
    • https://cdn.shopify.com/s/files/1/0434/2202/3847/files/bumexewexeta.pdf
    • https://cdn.shopify.com/s/files/1/0432/2308/9307/files/mimofe.pdf
    • https://cdn.shopify.com/s/files/1/0432/5956/0086/files/watch_muskaan_movie_online.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bijalikupuxamimidesedol.pdf
    • https://cdn.shopify.com/s/files/1/0430/5059/8562/files/xozuxegurumigejubosived.pdf
    • https://cdn.shopify.com/s/files/1/0432/4953/3088/files/61984075245.pdf
    • https://cdn.shopify.com/s/files/1/0432/1129/2829/files/zudubewipolaxizapito.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_off00006313.bin
fd1caba892719ef1ed00b2848b40c26e6f80556939cc65ea1ad8c064544e9dae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6313 5428 bytes
font_01_sfnt_off0000757c.bin
a0854be39c4ba31038110bf0ae96434d91b0440ade8c5248dd0130974debda0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x757C 9896 bytes

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