Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd4c5ec610a31cb9…

MALICIOUS

PDF

47.8 KB Created: 2020-09-05 14:27:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27a0782177f1ebe57b45598a5fa9f8e3 SHA-1: 91dc5627557e975c20881cb8ce792e7a2f4f09a6 SHA-256: fd4c5ec610a31cb91753dba212e3225fca983cf610d9610771143471dd15b214
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body text, though heavily obfuscated, contains the URL 'https://ttraff.link/wix?keyword=fusionner+2+pdf+adobe+reader+xi', suggesting a lure related to PDF manipulation. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, likely for SEO manipulation or to distribute the malicious payload. 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=fusionner+2+pdf+adobe+reader+xi
    • https://static.usrfiles.com/ugd/defd8a_595c6bfbd65e4972ace4e84705a875b8.pdf
    • https://static.usrfiles.com/ugd/b8c837_57f863d9bab34c468be7b9f1bb901095.pdf
    • https://static.usrfiles.com/ugd/909b15_e78709b95f8d4fc29bdbcdaee35f31b0.pdf
    • https://static.usrfiles.com/ugd/a421e3_016021aabfc946089255b040f3ae65e0.pdf
    • https://static.usrfiles.com/ugd/05e3ad_89f213d73d0b43d9a72d4954eaaa6d87.pdf
    • https://static.usrfiles.com/ugd/2f3ac6_e4751053ca0a4ae8a1e282eefb7e4b1e.pdf
    • https://static.usrfiles.com/ugd/ec0c41_ceb072fbd45a44c1942bf81c344ecf03.pdf
    • https://static.usrfiles.com/ugd/b8c837_ccb8a125ba5a459f8f601b6bfbbbc0f4.pdf
    • https://static.usrfiles.com/ugd/96bf9d_6f9903ede600418a9a0cec5c4f283c97.pdf
    • https://cdn.shopify.com/s/files/1/0435/7311/7087/files/the_chi-_lites_oh_girl.pdf
    • https://cdn.shopify.com/s/files/1/0462/7261/0464/files/resignation_letter_acceptance_email_format.pdf
    • https://cdn.shopify.com/s/files/1/0465/5110/5686/files/setoxedagosepit.pdf
    • https://cdn.shopify.com/s/files/1/0444/1423/8887/files/spinal_shock_vs_neurogenic_shock.pdf
    • https://cdn.shopify.com/s/files/1/0431/6649/8965/files/algebra_aptitude_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/1325/0965/files/vomasebitimuweremikuk.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_off00007017.bin
71e9ea19790b29cb635044f8dd1edee52ecdc0cdb1b91a906e60254bd0886fcd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7017 5100 bytes
font_01_sfnt_off0000816e.bin
bf00b1cf402cb0fdc532edf7735542c1bf3d465e6f88802d7da246c5ace135e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x816E 10128 bytes
font_02_sfnt_off0000a3fc.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA3FC 4324 bytes

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