Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca4732851a09cd4e…

MALICIOUS

PDF

52.8 KB Created: 2020-07-15 01:12:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d4c67cf6cd3be14b0826e9ce023129f SHA-1: b5078ab41341d7e31dbcb7b1ab710fd6d5188118 SHA-256: ca4732851a09cd4e46ae3be35ae71da4c92f4e838572233abc19807fa830ea0b
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, which is characteristic of a link farm designed for SEO manipulation or to host malicious content. One critical heuristic identified a link to known malicious redirector infrastructure (ttraff.cc), suggesting the document's primary purpose is to redirect users to harmful sites. The ML classifier strongly supports the malicious nature of this PDF.

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/wb?keyword=auditoria%20administrativa%20pdf%20benjamin%20franklin
    • http://files.isbhu.com/uploads/1/3/0/7/130775596/65ec04f003bed.pdf
    • http://files.wolfememorials.com/uploads/1/3/1/4/131452867/direlugifiladuvid.pdf
    • http://files.mytutorandmentor.com/uploads/1/3/1/0/131071037/2a69178650499.pdf
    • http://files.tstudioglass.com/uploads/1/3/1/3/131381802/pigabefajopoxa.pdf
    • http://files.isbhu.com/uploads/1/3/0/7/130775596/65e
    • https://cdn.shopify.com/s/files/1/0434/0717/9941/files/bewowazokivozulumomamu.pdf
    • https://cdn.shopify.com/s/files/1/0429/2454/0071/files/65414192943.pdf
    • https://cdn.shopify.com/s/files/1/0430/7379/8306/files/61502806811.pdf
    • https://wepupeteri.files.wordpress.com/2020/07/newej.pdf
    • https://dedowedetube.files.wordpress.com/2020/07/rufiregikofixina.pdf
    • https://jisimefadew.files.wordpress.com/2020/07/38011795214.pdf
    • https://cdn.shopify.com/s/files/1/0431/5470/2496/files/38490354676.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/81378437656.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/76957488457.pdf
    • https://cdn.shopify.com/s/files/1/0432/2977/3982/files/lewoxajivekepepu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0866/3456/files/86250969567.pdf
    • https://cdn.shopify.com/s/files/1/0429/2762/0249/files/zuturafisora.pdf
    • https://cdn.shopify.com/s/files/1/0434/3028/1381/files/46797086571.pdf
    • https://cdn.shopify.com/s/files/1/0428/3600/0931/files/70346444346.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_off0000907b.bin
8f5bb1d5c190e19ad058082237d5a7ccf6b5d495cd72bc56424a6081c4b4061b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x907B 5396 bytes
font_01_sfnt_off0000a2bf.bin
79b6b88704caf57c40ededcc9c59dd4912be9bb79110569144e238ea2fb8fa19		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2BF 10312 bytes

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