Malicious PDF — malware analysis report

Static analysis result for SHA-256 37d94fa65e126a08…

MALICIOUS

PDF

43.4 KB Created: 2020-09-05 18:15:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7a105695d9ce5fd578c6ac7ac61df439 SHA-1: 2283aa30ea13f1f3a8119ae47706bede126123cd SHA-256: 37d94fa65e126a084b64895174478e71bcd92ee8b7a6c71648a7538d42a7cebf
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying it as a redirector link to 'ttraff.ru'. Another heuristic indicates a link farm structure with 24 external PDF links, suggesting an attempt to drive traffic to potentially malicious or SEO-manipulated content. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the embedded links and the PDF structure point towards a malicious redirection campaign.

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.ru/pify?keyword=real+time+dashboard+power+bi+report+server In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/856cea_e018aa6396a64eb486b96932917f8f2b.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/3e5db3_ba9f699cee8f49589a8c620fd0889013.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/72ed28_58d05c5ac1d440fcb3700427b906318f.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/66c878_3f8cfd805df049ed8a81cc8dd58a8606.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_97bb5a741a0e419a82bba4f1c117ca3a.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/3bcfef_c0bd804fd2d14b8f803bfd19293eb3f3.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0463/7078/3393/files/formal_letter_for_disbursement_of_loan_amount.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7331/4715/files/pugujexuwedasimetolipijap.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2950/3908/files/nuwizatura.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2530/0647/files/pals_instructor_manual.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/bc0d1e_cffd160d521840b9b47c32ac8a5e2e00.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/857e61_79010edaf4ae4605a65dacc36720ea7a.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B5C 5496 bytes
SHA-256: eccc3f9428113af98f7547f8ab5a159174cd2c10d945b60bba263abb4c626c1e
font_01_sfnt_off00007df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DF0 10084 bytes
SHA-256: e827f033b14b3c0dc62c9307fab60a86ac7d5145880a2c60a8bd4893256a5237

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