Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d876d4278ea9208…

MALICIOUS

PDF

39.4 KB Created: 2020-09-10 21:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22b14d0029acaac92a09a6e4c15ffde3 SHA-1: fe837273d888c1758585f97c4f372dfe32961d1a SHA-256: 3d876d4278ea920839542e7e41047bb796c9502a441d3f36b7d44b0a742db118
154 Risk Score

Malware Insights

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

The PDF contains a link disguised as a visa application form, which redirects to a malicious URL. The PDF also contains a large number of links to external PDFs, likely for SEO poisoning or to host further malicious content. The ML classifier strongly indicated maliciousness, and the primary malicious URL is directly embedded.

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.club/wix?keyword=application+form+for+japan+visa
    • https://static.usrfiles.com/ugd/60ffa2_ffea49e984f344fbb6588f2f954933f5.pdf
    • https://static.usrfiles.com/ugd/b98abb_0c26a1a0a4f84f2f83c2509a9a2425fe.pdf
    • https://static.usrfiles.com/ugd/1e32c2_5859d54c4cc44a35bfbfe7eff71f9a45.pdf
    • https://static.usrfiles.com/ugd/4117a9_370a0d6e4a2b43578cd66289586b5d54.pdf
    • https://static.usrfiles.com/ugd/a76634_15603cc67f084e36be009fddbf3c9210.pdf
    • https://cdn.shopify.com/s/files/1/0434/3998/0710/files/bendy_in_nightmare_run_apk_uptodown.pdf
    • https://cdn.shopify.com/s/files/1/0429/1067/9203/files/admiralty_chart_catalogue_np131.pdf
    • https://cdn.shopify.com/s/files/1/0437/4816/3738/files/sap_bpc_10._0_installation_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/5675/1002/files/assignment_writing_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0433/9249/9868/files/caterpillar_generator_model_3406_manual.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_off00005e1d.bin
b696ef1c25587041ec56c88a6befc3f2708e10b56800bf7cdd4105499730c0ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E1D 5288 bytes
font_01_sfnt_off00007010.bin
6f65295df67d6130cb61189c7739f6571a63871ce082e42b9d05578e24c9478f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7010 9756 bytes

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