Malicious PDF — malware analysis report

Static analysis result for SHA-256 138e33b9a26317ac…

MALICIOUS

PDF

50.9 KB Created: 2020-08-31 07:18:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f5e63205894dbe172a326ee6b8d31da SHA-1: 47204da1d489b466aa0b2b82f514684fbef5b3a0 SHA-256: 138e33b9a26317acfe76458d21862766b35ff53e314b585916253a47376b56e9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which point to external PDF files. One of these links, https://ttraff.com/wix?keyword=messagerie+melanie+2, is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. This suggests the document is designed to lead users to malicious infrastructure.

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=messagerie+melanie+2
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_2c4b3a04de30470ea87aeb24f6f73715.pdf
    • https://static.usrfiles.com/ugd/8b97dd_e3f3cab79fc343699a8f965e73f21ce0.pdf
    • https://static.usrfiles.com/ugd/dd6616_b19fa2bf781842fe997486fcc026b7b7.pdf
    • https://static.usrfiles.com/ugd/ef253e_6735aedab5c7475eb4d68faad9963f80.pdf
    • https://static.usrfiles.com/ugd/6116da_426263e181f642f687a9390b7316e757.pdf
    • https://static.usrfiles.com/ugd/3e87bf_347eb48b200c4586b5c547518e985d89.pdf
    • https://static.usrfiles.com/ugd/d9d1f5_a377348ea6f74a43a253f730018e0dbc.pdf
    • https://static.usrfiles.com/ugd/b9801a_f173d85010f74f13afaa427edbde585a.pdf
    • https://static.usrfiles.com/ugd/b8c837_2b501853060a42d7b78d1b69e0aee4bf.pdf
    • https://cdn.shopify.com/s/files/1/0436/8721/5269/files/ps_vita_fifa_17.pdf
    • https://cdn.shopify.com/s/files/1/0440/7685/9544/files/product_disclaimer_template_free.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_off000082c3.bin
cc5adf6eefca31b086b8e125c2ea40f65da06c74dba313334ee2182267beaca7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82C3 5140 bytes
font_01_sfnt_off0000942e.bin
3a8d3aee95e4d8bcaf681b13e535639016d671df05490461f2d400aa86da37f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x942E 14036 bytes

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