Malicious PDF — malware analysis report

Static analysis result for SHA-256 c04fd8e0d488bfa9…

MALICIOUS

PDF

43.2 KB Created: 2020-09-05 03:41:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a66b38db75a1f2206fb77329b109766 SHA-1: dbae819de05c9411dc688111e462007a2ca25507 SHA-256: c04fd8e0d488bfa90f160e96335c93fce5bd832a828729df9a80ccc8be7e070f
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.me/pify?keyword=email+signature+template+free+html'. This URL is presented within the document body, disguised as a free HTML email signature template. The ML classifier also strongly flagged this PDF as malicious. The primary goal appears to be redirecting 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.me/pify?keyword=email+signature+template+free+html
    • https://static.usrfiles.com/ugd/c4ccc4_057399472b5c46ccb127b4149d566e32.pdf
    • https://static.usrfiles.com/ugd/b8c837_7c8bc529c4e34f1496d0b4591b5addac.pdf
    • https://static.usrfiles.com/ugd/c7a620_4f3f565817474550aa80f4722cb0efe5.pdf
    • https://static.usrfiles.com/ugd/5f5755_73ace9c1c7cb445d8cd717fd15e8bcfd.pdf
    • https://cdn.shopify.com/s/files/1/0460/3812/2655/files/tuzimexurovelino.pdf
    • https://cdn.shopify.com/s/files/1/0431/7039/8372/files/filijuvujapazedowaxibar.pdf
    • https://cdn.shopify.com/s/files/1/0428/4953/4111/files/72469471459.pdf
    • https://cdn.shopify.com/s/files/1/0433/8309/5452/files/strengthening_exercises_for_shoulder.pdf
    • https://static.usrfiles.com/ugd/cac9e4_ecd57a8e61dd48b6b5928321a11f7208.pdf
    • https://static.usrfiles.com/ugd/b80405_b0c9aba613f34e1da53856bffe08b916.pdf
    • https://static.usrfiles.com/ugd/b16523_4a5cdb8445f14f3296a8853d40892dae.pdf
    • https://cdn.shopify.com/s/files/1/0429/8774/9529/files/catalogo_de_produtos_suvinil.pdf
    • https://cdn.shopify.com/s/files/1/0427/6482/8838/files/kofufefigejalumo.pdf
    • https://cdn.shopify.com/s/files/1/0440/5172/6501/files/excel_indirect_worksheet_name_space.pdf
    • https://cdn.shopify.com/s/files/1/0429/1903/5033/files/punctuation_marks_quiz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006112.bin
723bb3d1aefd30c3a7cdb3b3ce53917432e82a966cee6dc429f33069f272b58e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6112 5272 bytes
font_01_sfnt_off000072ca.bin
72a3fe65f0a21df30f240897224061cfa351088b80a4eb601fb5defb198ec993		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72CA 2268 bytes
font_02_sfnt_off00007cdc.bin
0c063329ad84ae1f754a99dd7d80f34bb1d12785a581c9eb10859940de41d04c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CDC 10616 bytes

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