Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aa6988349a03aa0…

MALICIOUS

PDF

71.9 KB Created: 2020-12-22 13:22:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eeea861f75b841365c4df7e4b79fc4c6 SHA-1: 1d5b4360779d5e8d1499a179ad76460e2dc539f8 SHA-256: 9aa6988349a03aa013bae80ce5ce234e230a1228abda6911c71d8392378785d2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a link farm, likely for SEO manipulation or to distribute malware. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffmen.ru/strik?utm_term=fc+bayern+munich+wallpaper+hd
    • https://pidorisegis.weebly.com/uploads/1/3/4/7/134761928/vogak.pdf
    • https://cdn-cms.f-static.net/uploads/4419847/normal_5fd8183f037d3.pdf
    • https://danovijo.weebly.com/uploads/1/3/4/7/134774389/tabubi.pdf
    • https://kuruxodevudule.weebly.com/uploads/1/3/4/7/134728431/8144639.pdf
    • https://cdn-cms.f-static.net/uploads/4369665/normal_5fb8eebfb140e.pdf
    • https://gokaveruziniva.weebly.com/uploads/1/3/4/5/134580144/wobabiworiwijabalim.pdf
    • https://gafalevomunu.weebly.com/uploads/1/3/4/2/134235362/ac82b89a4c67.pdf
    • https://mepafuxutare.weebly.com/uploads/1/3/4/6/134660934/gosifigodasawi-dizowuxu-dazorodeviv-bulapivuzuwile.pdf
    • https://mewodufupojapoz.weebly.com/uploads/1/3/1/8/131857890/9193750.pdf
    • https://cdn-cms.f-static.net/uploads/4414688/normal_5fa3e791a19e1.pdf
    • https://bomikuwutivibi.weebly.com/uploads/1/3/4/5/134598741/6a18699839d471e.pdf
    • https://mudigaxufiwibu.weebly.com/uploads/1/3/4/6/134639529/zojitolajevav.pdf
    • https://cdn-cms.f-static.net/uploads/4420025/normal_5fb5a2aa111c7.pdf
    • https://fejalunaruxepiv.weebly.com/uploads/1/3/4/4/134489653/11ab5c1429a.pdf
    • https://kagodititaf.weebly.com/uploads/1/3/4/8/134868324/6193637.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tikoweravisixu/37014944010.pdf
    • https://s3.amazonaws.com/pajukovuxetu/zaturatekenabuwivu.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_off0000c2b5.bin
f0328d4ee9ca1d05c20f3f67c9acf6fe467a9b9fad61c4fd93593ce558023caa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B5 5424 bytes
font_01_sfnt_off0000d516.bin
cad3a34a58f1f5f624d6bc9dd0e69330e1ab3af2a96fe91512d87d9a8fc61137		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD516 12424 bytes
font_02_sfnt_off0000fc98.bin
541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC98 16204 bytes

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