Malicious PDF — malware analysis report

Static analysis result for SHA-256 31217ccd8d6219c9…

MALICIOUS

PDF

65.7 KB Created: 2020-09-05 21:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea9306ebb5bf17956be963f9bde64583 SHA-1: 1968e7a685cd639cf2ecb1bf512091d7e1fc1b97 SHA-256: 31217ccd8d6219c97aa517df1cd8b940d5037606010bc18434af0326bff51e8d
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.link/wix?keyword=busqueda+y+uso+de+la+informacion+pdf'. This indicates the document's primary purpose is to redirect users to a potentially harmful site. Additionally, a PDF link farm heuristic suggests the document is designed to host numerous external links, further supporting the malicious redirection intent. The ML classifier strongly flagged this PDF as malicious.

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.link/wix?keyword=busqueda+y+uso+de+la+informacion+pdf
    • https://cdn.shopify.com/s/files/1/0437/4118/4165/files/3914735195.pdf
    • https://cdn.shopify.com/s/files/1/0438/8516/6760/files/lisuxalixibizezuponitati.pdf
    • https://cdn.shopify.com/s/files/1/0469/9891/3176/files/invitation_size_envelope_template.pdf
    • https://cdn.shopify.com/s/files/1/0430/2117/2897/files/koxiwaruligub.pdf
    • https://static.usrfiles.com/ugd/271e65_b66b5d80ac554cb19ae917c5c0b626c9.pdf
    • https://static.usrfiles.com/ugd/64f9d2_d3a95fea2db04c5ea0dd8f1345b129e4.pdf
    • https://cdn.shopify.com/s/files/1/0432/5300/6494/files/1886082410.pdf
    • https://cdn.shopify.com/s/files/1/0427/6482/8838/files/wedajorulap.pdf
    • https://cdn.shopify.com/s/files/1/0435/4329/8207/files/free_spelling_worksheets_for_grade_4.pdf
    • https://cdn.shopify.com/s/files/1/0461/7814/0323/files/suxulapibomereb.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5d6.bin
e1549d2a01e9bd8bbaed1f2fc183644e6683bb544f16ef52ab39a97134bca490		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D6 5576 bytes
font_01_sfnt_off0000c8c2.bin
58204a99d0d906e909a6b6236da01e1654bf595cc0aa19f1248505bc8d4362ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C2 15264 bytes

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