Malicious PDF — malware analysis report

Static analysis result for SHA-256 73d4cef752e851e8…

MALICIOUS

PDF

40.2 KB Created: 2020-08-05 00:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7f25e37ae81b47cbd10c20a4ecd91da6 SHA-1: 58063be881af61ded6c2eaed80291bf3e9d72edd SHA-256: 73d4cef752e851e8ec31b715b9f630c5fd0d35cd56f19397afbda521c872a847
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links designed to redirect users to malicious infrastructure, specifically identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though heavily obfuscated, contains text related to a "medical fitness certificate for leave pdf" and a URL pointing to a redirector. The presence of numerous external PDF links suggests a link farm or SEO manipulation tactic to distribute malicious 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.com/pify?keyword=medical+fitness+certificate+for+leave+pdf
    • http://files.momentum-emporium.com/uploads/1/3/0/7/130776812/84f59e871db7.pdf
    • http://files.sterlingenterprisesllc.com/uploads/1/3/0/8/130874469/9545961.pdf
    • http://files.dollslakesidebb.com/uploads/1/3/2/6/132681356/4774822.pdf
    • http://files.allforkidscenter.com/uploads/1/3/1/8/131871467/kavetisex.pdf
    • http://files.applestar.org/uploads/1/3/1/4/131455543/rudufezikup.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/2440/6938/files/67335141896.pdf
    • https://cdn.shopify.com/s/files/1/0433/5442/3464/files/xabikevolefaxujaj.pdf
    • https://cdn.shopify.com/s/files/1/0427/5427/7532/files/74146825521.pdf
    • https://cdn.shopify.com/s/files/1/0433/3476/2654/files/veer_bala_rastogi_genetics_book.pdf
    • https://cdn.shopify.com/s/files/1/0438/3503/1712/files/48784707173.pdf
    • https://cdn.shopify.com/s/files/1/0430/3847/4397/files/dokaval.pdf
    • https://cdn.shopify.com/s/files/1/0432/9170/5500/files/77058191259.pdf
    • https://cdn.shopify.com/s/files/1/0429/5573/5193/files/49761150121.pdf
    • https://cdn.shopify.com/s/files/1/0428/5497/3606/files/nafamuvojujolukulek.pdf
    • https://cdn.shopify.com/s/files/1/0440/2446/3525/files/kozix.pdf
    • https://cdn.shopify.com/s/files/1/0434/3637/6214/files/98281755045.pdf
    • https://cdn.shopify.com/s/files/1/0427/9051/8940/files/guxujud.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/15138334831.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_off00005f89.bin
3fdbb1a75e7888dfbd6f8416227dd49d679d8fe80a148dbf3a9a392efc66f52e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F89 5212 bytes
font_01_sfnt_off0000716e.bin
087fbe0644d7f2a74cb5f291367bd04b39fbb3d794265a2f4a256c8705ca8807		 pdf-font-stream PDF embedded font (sfnt) at offset 0x716E 10012 bytes

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