Malicious PDF — malware analysis report

Static analysis result for SHA-256 9416a0dd91ed9449…

MALICIOUS

PDF

42.6 KB Created: 2020-07-08 22:31:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e12c818741a701fd83db7ecff7207ce2 SHA-1: 02d3f4f956e32943aa9f5c52b3d54a8b0de746fe SHA-256: 9416a0dd91ed944967fc09c54e09d22dfea8fbd09610f61f9487d3a346bb6ccc
154 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness. The embedded URLs, such as https://ttraff.com/wb?keyword=native%20son%20summary%20pdf, are likely part of this redirection scheme. No scripts were extracted, but the sheer volume of outbound links points to a malicious intent to redirect or distribute further 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/wb?keyword=native%20son%20summary%20pdf
    • http://files.mycherishedthoughts.com/uploads/1/3/1/4/131438629/868589e0b89e8.pdf
    • http://files.gtc-elite.org/uploads/1/3/2/6/132682570/netefikuvuboz_fifajog_jubakafa.pdf
    • http://files.luxbiteonline.com/uploads/1/3/2/6/132682883/7512348.pdf
    • http://files.thetlacademy.shop/uploads/1/3/1/3/131384789/dupive-madelubupazape-dezarekinoza.pdf
    • http://files.another-bright-idea.com/uploads/1/3/1/3/131379395/1123829.pdf
    • http://files.batrssocal.com/uploads/1/3/1/3/131384789/vipibifoxoteroxu.pdf
    • http://files.advfit.com/uploads/1/3/0/7/130776370/1d26b300.pdf
    • https://wixobesabad.files.wordpress.com/2020/07/bajebedol.pdf
    • https://jugowaxefij.files.wordpress.com/2020/06/zubakasusizazapezufi.pdf
    • https://pofiwofuleb.files.wordpress.com/2020/06/34968349769.pdf
    • https://wubigixetoso.files.wordpress.com/2020/06/84458932616.pdf
    • https://zavisiw607732123.files.wordpress.com/2020/06/vijif.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71409998288.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fovurasavelibegesixaga.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tuwaz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/7997453156.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rasamonuje.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mefiwi.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_off00006afe.bin
76fbd1f9ea054aebfecf99956cd7067d286b55ca19dc23d7d5c1acd10341f19e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AFE 5168 bytes
font_01_sfnt_off00007c82.bin
55ef1dafc2b9de6fc5fda4c60229aca222e46e9d02445fc6105becd5d65abf92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C82 9620 bytes

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