Malicious PDF — malware analysis report

Static analysis result for SHA-256 71c830eef367ab81…

MALICIOUS

PDF

328.0 KB Created: 2020-09-01 00:24:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e36c0b295d16745566cfaa3a992f8005 SHA-1: 23cf46ccf84306e1747f5addf20bff4109646084 SHA-256: 71c830eef367ab81255327c35722b2a010b684d57d8d6f0fcfe1d10256814b95
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely intended to lead the user to a phishing or malware download site. The document body, though heavily obfuscated, contains the same URL, reinforcing its malicious intent. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 3

  • 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.
  • 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.ru/pify?keyword=lipid+guidelines+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/0028/2783/files/godares.pdf
    • https://cdn.shopify.com/s/files/1/0434/3159/2102/files/visa_application_form_to_enter_japan_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/8922/9979/files/396080344.pdf
    • https://cdn.shopify.com/s/files/1/0437/8332/3806/files/revista_cero_grados_celsius.pdf
    • https://cdn.shopify.com/s/files/1/0432/6273/8592/files/bohemian_rhapsody_tablatura.pdf
    • https://cdn.shopify.com/s/files/1/0429/5216/3481/files/jatokipa.pdf
    • https://cdn.shopify.com/s/files/1/0439/2602/8456/files/ldap_injection_hackerone_report.pdf
    • https://static.usrfiles.com/ugd/cd79e3_4a6335343612427881f89b9714a6bb18.pdf
    • https://static.usrfiles.com/ugd/07e02c_5787223095684988b714c39089a0928b.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kiwovanigefuminif.pdf
    • https://cdn.shopify.com/s/files/1/0461/9675/2534/files/truly_free_credit_report_once_a_year.pdf
    • https://cdn.shopify.com/s/files/1/0433/1202/1662/files/jufifedelara.pdf
    • https://cdn.shopify.com/s/files/1/0433/0812/2270/files/28211266059.pdf
    • https://cdn.shopify.com/s/files/1/0433/6189/4565/files/pepuramumisigubowikezag.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0004b4c3.bin
cdec597ca2074c6cc8f27c4440feb30e54cd8f3d23b440b1728c9ced55da21b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x4B4C3 4844 bytes
font_01_sfnt_off0004c564.bin
217eb004f434446af26b4c22151edec5ef9aee8111b1a9d2cf7ebee1353c7026
pdf-font-stream PDF embedded font (sfnt) at offset 0x4C564 17304 bytes
font_02_sfnt_off0004fb4a.bin
49436f94d5abf10ca6af8af9848174aab82dfe7bc58a5146411d238fd5c76648
pdf-font-stream PDF embedded font (sfnt) at offset 0x4FB4A 16148 bytes