Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9fe030b27dd6de6…

MALICIOUS

PDF

37.7 KB Created: 2020-08-17 18:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb24eeccf48d4b20572b5198f0897bd4 SHA-1: 4b91ad2d122f7c9fa987a33b841b6ab071e53cae SHA-256: c9fe030b27dd6de6f0a7302ba2d44a542cbf9e770a5920dd78e3b7b3a93634ee
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded links, including one to a known malicious redirector at 'ttraff.com' which is disguised as 'certiport excel exam answers'. This suggests a phishing or scam attempt to redirect users to malicious content. The ML classifier also strongly flagged this PDF as malicious.

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/pify?keyword=certiport+excel+exam+answers
    • http://files.dishinstalldubai.com/uploads/1/3/0/7/130775223/zetovudumufo.pdf
    • http://xoxix.oakhillsoregon.com/uploads/1/3/0/7/130739553/639c55a7eb.pdf
    • http://files.online-catalog-of-professional-artists.com/uploads/1/3/2/8/132814239/9440826.pdf
    • https://cdn.shopify.com/s/files/1/0429/5832/3865/files/83876879148.pdf
    • https://cdn.shopify.com/s/files/1/0429/9754/7157/files/90316756107.pdf
    • https://cdn.shopify.com/s/files/1/0431/1321/8210/files/lexical_scope_javascript.pdf
    • https://cdn.shopify.com/s/files/1/0435/7645/9422/files/28907808809.pdf
    • https://cdn.shopify.com/s/files/1/0434/5751/1590/files/rawosakazijitatoxiw.pdf
    • https://cdn.shopify.com/s/files/1/0439/6145/0654/files/dugerinedofivuj.pdf
    • https://cdn.shopify.com/s/files/1/0440/6365/4040/files/merge_files_with_adobe_acrobat_pro.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_off0000566a.bin
e2f432a124477d2ab96ec259bbf4151cf9f87affa1ccb07dd40fc2ee220db102		 pdf-font-stream PDF embedded font (sfnt) at offset 0x566A 5144 bytes
font_01_sfnt_off000067df.bin
48636486b7fb86e788e45885b1db6561918f52a6521386b3c04540c73976789e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67DF 10096 bytes

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