Malicious PDF — malware analysis report

Static analysis result for SHA-256 75d2e9ee1ee6bdfb…

MALICIOUS

PDF

102.0 KB Created: 2020-08-14 20:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce3a6957ff293603f5f3bd34f2b836a8 SHA-1: 097695713164dcb2b1c654e5d6c2c48ded279a4b SHA-256: 75d2e9ee1ee6bdfb9d416b05d7aef18b5d39d2376877f6d48a3b4914ac25bfde
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a malicious redirector at 'https://ttraff.ru/wb?keyword=segregation%20meaning%20pdf'. The document body, though heavily obfuscated, appears to contain this URL, suggesting an attempt to leverage SEO tactics to drive traffic to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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/wb?keyword=segregation%20meaning%20pdf
    • http://sasexig.wendyjfox.com/uploads/1/3/2/6/132695465/bojuvef.pdf
    • http://zapam.adelaidefamefestival2020.com/uploads/1/3/1/1/131164250/poposagebepeg.pdf
    • http://files.exploitnomore.org/uploads/1/3/2/3/132302998/f7c17a5cc147.pdf
    • http://files.mckinneyfalls.org/uploads/1/3/0/7/130775484/nizituwetujat-vovora-bisitini.pdf
    • http://fejezip.basecampiceland.is/uploads/1/3/0/7/130739024/nowedefajuzesibipit.pdf
    • https://cdn.shopify.com/s/files/1/0447/6990/2743/files/5409153297.pdf
    • https://cdn.shopify.com/s/files/1/0433/7899/9446/files/1801817799.pdf
    • https://cdn.shopify.com/s/files/1/0428/3914/6662/files/ragopa.pdf
    • https://cdn.shopify.com/s/files/1/0432/0621/3789/files/87925874218.pdf
    • https://cdn.shopify.com/s/files/1/0431/5804/4823/files/cetoacidosis_diabetica_minsal.pdf
    • https://cdn.shopify.com/s/files/1/0432/9416/3109/files/28490750352.pdf
    • https://cdn.shopify.com/s/files/1/0431/0892/5600/files/faxenidupilogixezidesofaw.pdf
    • https://cdn.shopify.com/s/files/1/0429/1087/5815/files/fapetukisodezeturit.pdf
    • https://cdn.shopify.com/s/files/1/0438/0560/6049/files/17563161146.pdf
    • https://cdn.shopify.com/s/files/1/0428/4206/3004/files/9660274728.pdf
    • https://cdn.shopify.com/s/files/1/0429/2490/0515/files/nunuzijiripasawup.pdf
    • https://cdn.shopify.com/s/files/1/0433/8201/4108/files/77682686004.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_off00014377.bin
f49fab6c6d85c631e33c641c202d548a588508f85cc90029ab1129ee2d5a61e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x14377 5252 bytes
font_01_sfnt_off0001553a.bin
590ed035a2eb1fee0f56861d8580e269044d0d8c8c83437cf75e553bd9301d4b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1553A 17276 bytes