Malicious PDF — malware analysis report

Static analysis result for SHA-256 070dee512a58289e…

MALICIOUS

PDF

40.7 KB Created: 2020-08-31 13:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 55a54fb200cd33d65df193b30390a326 SHA-1: 61ddc25b2fddf11d3e8a828e0ce9dfd4ffd21d3c SHA-256: 070dee512a58289e08ac4be63a0c339cde64b5acc737aca0db58d62f5431f237
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and heuristics indicate it contains a mass external PDF link farm. One of the embedded URLs, 'https://ttraff.com/wix?keyword=appium+android+home+button', is identified as a malicious redirector. The document body, though heavily obfuscated, contains this URL and numerous other links to PDFs hosted on 'static.usrfiles.com', suggesting a coordinated effort to manipulate search engine results or distribute malicious content.

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/wix?keyword=appium+android+home+button
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/79e5df_9c4d2a2a1fc440a88b05a0c0025bfdd7.pdf
    • https://static.usrfiles.com/ugd/b8c837_d1b07e5cc80f421399e748d3e082ab2a.pdf
    • https://static.usrfiles.com/ugd/9219f8_2122601f95c54a639761712a80f2e35f.pdf
    • https://static.usrfiles.com/ugd/b8c837_7155f7c6b781428d89e675d6822e7004.pdf
    • https://static.usrfiles.com/ugd/b8c837_b100a3be4a034c869ea71974aaa80930.pdf
    • https://static.usrfiles.com/ugd/e745be_c90973c07045458e9cd8a14dc6663350.pdf
    • https://static.usrfiles.com/ugd/865d50_74a2a7890c274efeb1dd11a00705804c.pdf
    • https://static.usrfiles.com/ugd/b8c837_424092784b1441f19ed5e9047d8dc79f.pdf
    • https://static.usrfiles.com/ugd/b8c837_d29c27e147c94f83a57bab91cceceba3.pdf
    • https://static.usrfiles.com/ugd/a107db_bece1569a3e34c5fa28f9fa99914cdd0.pdf
    • https://static.usrfiles.com/ugd/b8c837_cf3e10c080e9492e8cd5ef00654012a3.pdf
    • https://static.usrfiles.com/ugd/b8c837_529951ec6117469db58261daf5e5997e.pdf
    • https://static.usrfiles.com/ugd/ea5d7b_89afcfaacd78407a8c1f2839157b9f1e.pdf
    • https://static.usrfiles.com/ugd/b8c837_a4f1014a505f41c78a230d1c308fe998.pdf
    • https://static.usrfiles.com/ugd/b8c837_8b2e0677ffdc434289e2fae52a9c2527.pdf
    • https://static.usrfiles.com/ugd/40b9e6_05eadff5a2054548a7ceff7c0c09914f.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006029.bin
b3d0e88e95b094b6cf72861c2136aeb5a9b07e17ead7de215041ecff70e4774a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6029 5116 bytes
font_01_sfnt_off0000715c.bin
66f5be1602f953037def2d303faf38db0d30b8750855e8fab5cf798370e60c4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x715C 10744 bytes

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