Malicious PDF — malware analysis report

Static analysis result for SHA-256 0173ad81cba18e6f…

MALICIOUS

PDF

46.8 KB Created: 2020-08-31 21:22:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5ba6fa9ba224e0cec34f566d0abf43a6 SHA-1: 58208ab977ab1e45fe688498e57f3a11d7ba67f3 SHA-256: 0173ad81cba18e6f395bb867d03393471c4aafa6313649c428455b08b8cf3041
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

This PDF document contains a large number of embedded links, many of which point to a link farm designed to host other PDFs. One of the primary links, https://ttraff.com/wix?keyword=mind+relaxing+instrumental+music+free, is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the intent is to redirect the user 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=mind+relaxing+instrumental+music+free
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/314c35_f1b8b9088ccc44a2b7bb9317dd52e01a.pdf
    • https://static.usrfiles.com/ugd/e5a943_0eb4f7dcc558473fbb1a17ec856a35c5.pdf
    • https://static.usrfiles.com/ugd/d7ba0f_865dce3fc90c4e33b1f915d72ae5d97c.pdf
    • https://static.usrfiles.com/ugd/b8c837_72cc9411a6e04e4992ef968791678a7a.pdf
    • https://static.usrfiles.com/ugd/9219f8_5fbcd154b15b4f08b2f349f1b582f913.pdf
    • https://static.usrfiles.com/ugd/87a178_0e3e42d38af2474daecaa4b921c8a958.pdf
    • https://static.usrfiles.com/ugd/f1780b_885e144c83b343d68262ad980f46b876.pdf
    • https://cdn.shopify.com/s/files/1/0433/0435/3950/files/fiwogixigokugo.pdf
    • https://cdn.shopify.com/s/files/1/0437/2860/1237/files/egzamin_gimnazjalny_angielski_gramatyka.pdf
    • https://cdn.shopify.com/s/files/1/0433/7877/0085/files/biografia_de_edilson_rodrigues_silva.pdf
    • https://cdn.shopify.com/s/files/1/0430/7566/6073/files/project_management_raci_matrix_template.pdf
    • https://cdn.shopify.com/s/files/1/0432/6624/4766/files/77837382160.pdf
    • https://static.usrfiles.com/ugd/b8c837_d83fa47f809d49b995d078fd06782ada.pdf
    • https://static.usrfiles.com/ugd/ace02d_5cbe82f96d7f41ccaf676439c236ea08.pdf
    • https://static.usrfiles.com/ugd/2ddd39_5e18421fab194638830930e6fd156e54.pdf
    • https://static.usrfiles.com/ugd/ac51ce_742ca2b01a7f4f67a0f6258f4c5779cd.pdf
    • https://static.usrfiles.com/ugd/bfbc46_5c682b25ef504ab8b6765f2b5209ec62.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_off0000768f.bin
0b9cbffa9a4ebd6574c2e7f35bde1b59c8cde0e398d7c4a94ecb456c91a57988		 pdf-font-stream PDF embedded font (sfnt) at offset 0x768F 5416 bytes
font_01_sfnt_off000088f8.bin
3e80435dc37dbbe45c1e0122a45ffea62b83dc4d542966816e323f6571463a6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88F8 11260 bytes

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