Malicious PDF — malware analysis report

Static analysis result for SHA-256 525199ae8c8360ac…

MALICIOUS

PDF

41.7 KB Created: 2020-08-30 15:13:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8fa603f94f7602a68f12ca1dfbf0b71 SHA-1: da35a1d0ea27d6a9aa86b406a383950d978375dd SHA-256: 525199ae8c8360ac9383b06f37d728484d02a08694519d72a2ef035c927c688b
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is designed to lead users to potentially harmful content. The document body also contains this URL, suggesting an attempt to trick the user into clicking it. The presence of a large number of external PDF links, many hosted on Shopify, indicates a link farm SEO tactic, likely to obscure the true malicious destination or to generate traffic. 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/wix?keyword=give+me+liberty+5th+edition+volume+1+citation
    • https://cdn.shopify.com/s/files/1/0429/4914/8828/files/86905885010.pdf
    • https://cdn.shopify.com/s/files/1/0433/6952/9509/files/pomofaguwojetive.pdf
    • https://cdn.shopify.com/s/files/1/0428/4638/8380/files/20374281021.pdf
    • https://cdn.shopify.com/s/files/1/0433/6995/5486/files/50985509050.pdf
    • https://cdn.shopify.com/s/files/1/0439/8612/4958/files/koninilivuxutirafod.pdf
    • https://cdn.shopify.com/s/files/1/0432/7908/9824/files/72300221417.pdf
    • https://cdn.shopify.com/s/files/1/0434/6521/2066/files/tsc_performance_appraisal_form.pdf
    • https://cdn.shopify.com/s/files/1/0434/4633/7693/files/ragijosiropusinejopexit.pdf
    • https://cdn.shopify.com/s/files/1/0430/5249/9098/files/wepejedikugitumig.pdf
    • https://cdn.shopify.com/s/files/1/0436/9930/6650/files/kosibatodoziladirumoseli.pdf
    • https://static.usrfiles.com/ugd/5ad03d_a6c9342afa134decb88d91a0ac174c0c.pdf
    • https://static.usrfiles.com/ugd/e643da_adfce133b77f4f6fa685dc0a97e4baef.pdf
    • https://cdn.shopify.com/s/files/1/0427/7963/9967/files/95270780462.pdf
    • https://cdn.shopify.com/s/files/1/0430/5649/6791/files/lotus_flower_images_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/4614/2114/files/pafemulixixojizosamawav.pdf
    • https://cdn.shopify.com/s/files/1/0434/4935/2349/files/numavanetejemesitetud.pdf
    • https://cdn.shopify.com/s/files/1/0430/6917/8017/files/navemuvirukanemodepadu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000055c3.bin
2203376cb8f7f2f786ef5247301e5c792cb3d3205658719ac1d999bf9335713e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55C3 5392 bytes
font_01_sfnt_off000067fa.bin
b61677a936eb11db4d202278ce3193944b1b2f833f0858bb10ccd9b2e3d251ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67FA 10288 bytes
font_02_sfnt_off00008b24.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B24 4324 bytes

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