Malicious PDF — malware analysis report

Static analysis result for SHA-256 42d1a3bedca996e4…

MALICIOUS

PDF

45.4 KB Created: 2020-09-07 14:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2803b0ac7a93ee9257a528835a5bbe8d SHA-1: 0b04fa95e6eaf7da82b62ec6bc94bacd3d991de3 SHA-256: 42d1a3bedca996e45e28121eb7327c7df6bc3722184211e05c86b4e43f5f7cb0
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, forming a link farm. One of these links, https://ttraff.me/wix?keyword=expert+option+software, points to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the same suspicious URL, suggesting a lure for users to click through to a potentially harmful site.

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.me/wix?keyword=expert+option+software
    • https://cdn.shopify.com/s/files/1/0436/4356/8278/files/24202441220.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/10217245918.pdf
    • https://cdn.shopify.com/s/files/1/0434/7589/4437/files/tepikakeviwarodo.pdf
    • https://cdn.shopify.com/s/files/1/0436/1699/3440/files/jebetugotijidowugudev.pdf
    • https://cdn.shopify.com/s/files/1/0462/9148/4833/files/ela_vocabulary_test_prep_escape_answer_document.pdf
    • https://static.usrfiles.com/ugd/8d46c2_01407f3977c34501ad100c7df7332789.pdf
    • https://static.usrfiles.com/ugd/b6edda_05351321403547c2ad57cf31a02e9e4a.pdf
    • https://static.usrfiles.com/ugd/3e9e83_f271bdf401d84d44a2d7da9abae316b9.pdf
    • https://static.usrfiles.com/ugd/b80405_59699aed1349480296f0f744f57c8075.pdf
    • https://static.usrfiles.com/ugd/0d002d_3553667c64d84445808c606e473f8327.pdf
    • https://static.usrfiles.com/ugd/a4e402_1184d9976c4748c1a408cd0a68483c38.pdf
    • https://static.usrfiles.com/ugd/2c608b_d6d043a283dd4eb18af3552bc9e8d593.pdf
    • https://static.usrfiles.com/ugd/ef7486_94ec010e0f7448ffba77a6dfa4dcbb3d.pdf
    • https://static.usrfiles.com/ugd/b8c837_7201f6fead11433995dd04fb9a5e2270.pdf
    • https://static.usrfiles.com/ugd/575363_97b54ac8bdab43df932417cfed5922b7.pdf
    • https://static.usrfiles.com/ugd/1c8c1e_7dd8f49f26344abfaf0a6221be97dfa3.pdf
    • https://static.usrfiles.com/ugd/b8c837_0206cdbcf938466db3dff56054dae041.pdf
    • https://static.usrfiles.com/ugd/4d935e_7e60cb42195343f1a404d7a684e74156.pdf
    • https://static.usrfiles.com/ugd/34ec99_51874ee9b25448c2a3c8d590c108481f.pdf
    • https://static.usrfiles.com/ugd/9fc8c3_59ff252e0f2a49aa93887e67515c17e9.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_off000074c5.bin
fbea4af677dc4f952c03a7c2d1309a802fedce842f8e30034ff5e0b1a51ee703		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74C5 4980 bytes
font_01_sfnt_off000085e0.bin
16b9eb971d12ceb1409e9d522a84591603afe2428e45de7e99dd7b01314d8359		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85E0 10208 bytes

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