Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc55be268ca1baa1…

MALICIOUS

PDF

52.9 KB Created: 2020-07-19 04:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1af4f369e3fbaa826199c43530ab7df6 SHA-1: a54a54799051a735e200ac64fdf9aa71efa4bd4a SHA-256: fc55be268ca1baa155592297c7a293a2727bdc9de8cc0cf0d218f9a4269c79ec
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, a technique often used for SEO spam or to redirect users to malicious sites. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a link to ttraff.com, indicating a known malicious redirector. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the sheer volume of links and the identified redirector strongly suggest a malicious intent to lead the user 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.com/wb?keyword=single%20and%20multi%20carrier%20quadrature%20amplitude%20modulation%20pdf
    • http://files.policestickers.com/uploads/1/3/1/4/131453735/romotivenuwe.pdf
    • http://files.ambleon.net/uploads/1/3/1/0/131070125/zulalusimutolosu.pdf
    • http://files.scdb2012.com/uploads/1/3/1/1/131164479/zekixigedaxo.pdf
    • http://files.quadrysteria.com/uploads/1/3/2/8/132814990/a1a2c4.pdf
    • http://files.simicollins.com/uploads/1/3/0/7/130775977/baxanogagiwe_xapexide.pdf
    • http://files.weddingphotoscyprus.com/uploads/1/3/1/3/131379543/a5e4ba6d5.pdf
    • http://files.northshorecustomconversions.co.uk/uploads/1/3/1/3/131383575/xogikakirefovo.pdf
    • http://files.audreyslittlelovebugs.com/uploads/1/3/1/4/131408581/51f80.pdf
    • http://files.northshorecustomconvers
    • https://lazasivi.files.wordpress.com/2020/06/86233384665.pdf
    • https://bosakat.files.wordpress.com/2020/07/rulawurajinilabajobo.pdf
    • https://badijipim.files.wordpress.com/2020/06/zakisotoxom.pdf
    • https://milinubed.files.wordpress.com/2020/07/turutoresurutoworuwal.pdf
    • https://cdn.shopify.com/s/files/1/0428/3367/4396/files/49619462797.pdf
    • https://cdn.shopify.com/s/files/1/0428/2089/4886/files/22095912227.pdf
    • https://cdn.shopify.com/s/files/1/0431/0922/0501/files/72974278063.pdf
    • https://cdn.shopify.com/s/files/1/0429/3401/0015/files/27079871892.pdf
    • https://cdn.shopify.com/s/files/1/0427/5562/1031/files/bimora.pdf
    • https://cdn.shopify.com/s/files/1/0430/7664/9124/files/90319358066.pdf
    • https://cdn.shopify.com/s/files/1/0431/5054/0964/files/13846743542.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_off00009138.bin
76fedc5f38e9b589b64a1e70aa7307068a0764a713eea7faf9120592bf4e3258		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9138 5408 bytes
font_01_sfnt_off0000a371.bin
e36d60439fabb252818be45c9c09bdc83de7c5478325d337ea6b9e2a81b58d1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA371 10040 bytes

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