Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a1832736cd61a55…

MALICIOUS

PDF

49.4 KB Created: 2020-07-30 05:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de85dad68f6350982bbe6fec019bffb5 SHA-1: 31c84e239aa87688af0462061af36bb705c99eac SHA-256: 9a1832736cd61a559a948ce8b91c212371c6c00285ee6c8d393ce02f2cfdb833
152 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it points to known malicious infrastructure. Additionally, PDF_SEO_LINK_FARM suggests a large number of outbound links, likely for SEO manipulation or to host further malicious content. The document body, though heavily obfuscated, contains text related to 'bank exam syllabus pdf download 2020', aligning with a lure to trick users into clicking the malicious link.

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=bank+exam+syllabus+pdf+download+2020
    • http://files.sportstraumalondon.co.uk/uploads/1/3/1/4/131438616/1879189.pdf
    • http://files.gemonogram-bay-area.com/uploads/1/3/1/3/131384660/5313c34941.pdf
    • http://files.rinjaniindah.com/uploads/1/3/1/4/131454143/3933427.pdf
    • http://files.oscarbaptistchurch.com/uploads/1/3/0/8/130814297/8c5eaa.pdf
    • http://files.douglasclarkhypnosis.com/uploads/1/3/0/7/130775856/6837670.pdf
    • https://cdn.shopify.com/s/files/1/0431/1384/0794/files/jafosukebovimozazawekeva.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dewubi.pdf
    • https://cdn.shopify.com/s/files/1/0434/0659/0104/files/dakuxavifeledawalavume.pdf
    • https://cdn.shopify.com/s/files/1/0434/3513/1046/files/dulenaki.pdf
    • https://cdn.shopify.com/s/files/1/0432/2358/0830/files/jijogusaxediwalojubeju.pdf
    • https://cdn.shopify.com/s/files/1/0432/2597/2904/files/dadonisafaxi.pdf
    • https://cdn.shopify.com/s/files/1/0437/9901/9682/files/40964262447.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/77160317291.pdf
    • https://cdn.shopify.com/s/files/1/0430/3811/3955/files/95699007250.pdf
    • https://cdn.shopify.com/s/files/1/0437/0402/5242/files/26093815362.pdf
    • https://cdn.shopify.com/s/files/1/0439/1564/1000/files/nafodafaxufaguwazaxasewok.pdf
    • https://cdn.shopify.com/s/files/1/0429/1044/9830/files/nurowifupevigativo.pdf
    • https://cdn.shopify.com/s/files/1/0432/6018/2692/files/jiwigavu.pdf
    • https://cdn.shopify.com/s/files/1/0440/6640/6550/files/91131483872.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_off000082d5.bin
126c53ace5855cae17bd61cdc1bdfbe419188a9676850a26837f422a5a6914fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82D5 5632 bytes
font_01_sfnt_off000095fb.bin
7b29b9b1d1f921bf2d6836ed0deb8f1a351139590ed7529e95caf39e9f036896		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95FB 9932 bytes

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