Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c08eb2be61f793e…

MALICIOUS

PDF

64.5 KB Created: 2020-07-23 05:18:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dae9a0facda37cb91fa62b1f66f2e26f SHA-1: 6f18cbf8b0e2fec60893e4ceb0efab7a63929120 SHA-256: 6c08eb2be61f793e98225e7919013a074c8410db2c854d995be140945a5585b7
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, with one identified as a malicious redirector. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a malicious intent to redirect users to harmful content. The document body is heavily obfuscated, but the heuristics strongly suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=essentials+of+clinical+cardiology+pdf
    • http://files.karenapps.com/uploads/1/3/1/8/131872048/c9691f.pdf
    • http://files.jennyharrison-author.com/uploads/1/3/0/7/130775677/5549204.pdf
    • http://files.hawaiistateptsa.org/uploads/1/3/2/6/132682040/dojirobodos.pdf
    • http://files.peachfuzztranslations.com/uploads/1/3/0/9/130969986/b58c0c94bf0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/4722/3458/files/xukijadarofutisilesuxa.pdf
    • https://cdn.shopify.com/s/files/1/0429/6497/5765/files/35010499232.pdf
    • https://cdn.shopify.com/s/files/1/0433/0363/3051/files/14311708912.pdf
    • https://cdn.shopify.com/s/files/1/0433/8037/5704/files/85191408062.pdf
    • https://zodizijemas.files.wordpress.com/2020/07/xadoxixojatefav.pdf
    • https://tovotuwag.files.wordpress.com/2020/06/gigiresatuwex.pdf
    • https://zitipon.files.wordpress.com/2020/06/4154804693.pdf
    • https://cdn.shopify.com/s/files/1/0431/2609/6036/files/99096355043.pdf
    • https://cdn.shopify.com/s/files/1/0431/7003/7911/files/71581134190.pdf
    • https://cdn.shopify.com/s/files/1/0428/0333/1231/files/vutunuxogamixaba.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bebupikisanomagidilu.pdf
    • https://cdn.shopify.com/s/files/1/0432/9812/8036/files/47861006325.pdf
    • https://cdn.shopify.com/s/files/1/0435/8920/6174/files/56801233093.pdf
    • https://cdn.shopify.com/s/files/1/0435/8347/1771/files/vokinumumuwixinijazapobeg.pdf
    • https://cdn.shopify.com/s/files/1/0433/3309/1480/files/vejejoposavese.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bee8.bin
eec251459b654c63d7da8e2443e51002a761b6b82c124bb99b4fcd7768529012		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE8 5172 bytes
font_01_sfnt_off0000d092.bin
0cdf3041c41455128bf3a7aaf43b68b6baf4c7a69a5b9e4802e552e26caecd4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD092 10296 bytes

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