Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f8efffc8f0a8f57…

MALICIOUS

PDF

42.2 KB Created: 2020-08-31 15:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2db1c3d588a08b604ef84727803e3092 SHA-1: 9ca587eea4182323f33d4907754ba8c1adf972dd SHA-256: 5f8efffc8f0a8f57de84d590511d50f5abc225c9c986e58caa28a3489539a479
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, with one pointing to a known malicious redirector at 'https://ttraff.com/wix?keyword=math+worksheets+grade+6+long+division'. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to trick users into visiting it. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful 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=math+worksheets+grade+6+long+division
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/8297/3346/files/vin_check_florida.pdf
    • https://cdn.shopify.com/s/files/1/0427/8861/8396/files/38846230181.pdf
    • https://cdn.shopify.com/s/files/1/0430/8631/5671/files/62653632023.pdf
    • https://static.usrfiles.com/ugd/accd1f_497bb654774843a0802fe99a9bdcf95e.pdf
    • https://static.usrfiles.com/ugd/7c3584_ee32236b8e2c42b6a6b95c7a957c98f9.pdf
    • https://static.usrfiles.com/ugd/6116da_dbab37f7e33e413d8fbe8736ee0498ab.pdf
    • https://static.usrfiles.com/ugd/d5cf39_b6594b2759264624819de65328e1ac92.pdf
    • https://static.usrfiles.com/ugd/e3ff21_da9a34982fe140c1a727aa1f1e57a2a8.pdf
    • https://static.usrfiles.com/ugd/0f5b72_24209ee0ba094305bd8c68232513c443.pdf
    • https://static.usrfiles.com/ugd/fd7405_d315385dd4514225af428fcbc656e720.pdf
    • https://static.usrfiles.com/ugd/b8c837_a67bc1f0438b4ec1a376832ac4d5cd73.pdf
    • https://static.usrfiles.com/ugd/72b0e7_382d9c314fe541b5b32b7d87c4e36aef.pdf
    • https://static.usrfiles.com/ugd/b8c837_e1e15348104e4cf1a43f89dd17fac07f.pdf
    • https://static.usrfiles.com/ugd/b8c837_410ac11a24bc4a97b1c6fbf94b111d5f.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005acd.bin
b099a957b481362316fe16a734f68d6bb2d648d846f0414a31860edb3c99f120		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ACD 5248 bytes
font_01_sfnt_off00006cba.bin
46575766316e3ae964b9d96241a260d6a11e84994b9eab3321b689aed18c41e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CBA 9560 bytes
font_02_sfnt_off00008d84.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D84 4324 bytes

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