Malicious PDF — malware analysis report

Static analysis result for SHA-256 33fb8ed6686627a7…

MALICIOUS

PDF

50.1 KB Created: 2020-08-06 20:53:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a32bb73a5f4bce208d16467f1908428 SHA-1: ffdc4c6f65140e9d936ac3aa54ef7470fea48329 SHA-256: 33fb8ed6686627a716d7703fab0359ce43b35c25a26affb7351cce0039e57d04
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector infrastructure. The document body, though partially corrupted, includes the URL 'https://ttraff.ru/pify?keyword=carrying+capacity+ecology+pdf', suggesting an attempt to redirect users to malicious content. The presence of a large number of external PDF links further indicates a link farm or SEO manipulation tactic, likely to obscure the malicious redirector.

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.ru/pify?keyword=carrying+capacity+ecology+pdf
    • http://files.urlingfordchildcare.com/uploads/1/3/1/0/131069764/runadiv.pdf
    • http://files.sueelliottart.com/uploads/1/3/1/4/131453436/xakirelole.pdf
    • http://files.tiffanybryson.com/uploads/1/3/0/7/130775506/sonij-vexev-lutige-vokepozesafawer.pdf
    • http://files.newhopemyanmar.org/uploads/1/3/1/1/131164129/lenimujux.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/0485/4426/files/fofet.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sazofafusogowo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0925/3286/files/25939733327.pdf
    • https://cdn.shopify.com/s/files/1/0430/0275/7281/files/54823544912.pdf
    • https://cdn.shopify.com/s/files/1/0431/1570/8573/files/perutepipilalojel.pdf
    • https://cdn.shopify.com/s/files/1/0435/8481/5259/files/advanced_computer_architecture_tutorialspoint_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/1436/4059/files/dipasu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4300/4322/files/32702623661.pdf
    • https://cdn.shopify.com/s/files/1/0433/1811/6510/files/98750408810.pdf
    • https://cdn.shopify.com/s/files/1/0431/1010/5255/files/pumegosewalafifizudasiti.pdf
    • https://cdn.shopify.com/s/files/1/0428/4622/4551/files/95928035044.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000071bd.bin
a13647a2a1064824801ba90f820f3c4344c9b51beb341dc816fcb587403d6468		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71BD 5152 bytes
font_01_sfnt_off00008362.bin
d781252d532faf3caadef5a5c9aa2aea2f1e4a1092534b377065946de98aaace		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8362 10132 bytes
font_02_sfnt_off0000a644.bin
23e5e0a6ad5360bf10628433507e5aab34c42d7d900ccb2a5214949f2168b422		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA644 16112 bytes

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