Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b5f1ccd9bad2d48…

MALICIOUS

PDF

49.6 KB Created: 2020-08-21 21:10:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d592d9de609ab7aed4b6a74aeb821f4 SHA-1: 5d6bfd68b68dfb2523071ef2f55af3bd2350ab66 SHA-256: 3b5f1ccd9bad2d480b6b0b95ac26061a2ab4301e2c1bcdaedb448611fe54ae0e
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to domains associated with SEO spam or redirectors. The primary malicious URL identified is https://ttraff.ru/pify?keyword=french+english+dictionary++pc, which is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users to malicious infrastructure. The ML classifier strongly indicated maliciousness.

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=french+english+dictionary++pc
    • http://files.gabriellapomata.com/uploads/1/3/0/8/130814169/webos_jonafudad_polakelopujewi.pdf
    • http://files.deannapaulsen.com/uploads/1/3/0/9/130969593/2471376.pdf
    • http://files.modomiophilly.com/uploads/1/3/1/4/131406173/6141423.pdf
    • http://dabago.themovementexperience.com/uploads/1/3/1/0/131069934/ed8d0295b4b5bb.pdf
    • http://files.bookhivebeerclub.com/uploads/1/3/0/9/130969910/f65beae6b726.pdf
    • https://cdn.shopify.com/s/files/1/0428/9966/9151/files/88238189205.pdf
    • https://cdn.shopify.com/s/files/1/0432/2567/7982/files/17246678209.pdf
    • https://cdn.shopify.com/s/files/1/0432/2977/3981/files/79038367796.pdf
    • https://cdn.shopify.com/s/files/1/0439/9448/0798/files/48025114259.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7416/files/bunatiwotametunarurase.pdf
    • https://cdn.shopify.com/s/files/1/0429/7896/7703/files/welogexu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6645/8265/files/introductory_combinatorics_solution_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/8370/1151/files/67159533781.pdf
    • https://cdn.shopify.com/s/files/1/0449/1457/3467/files/union_budget_2020_bankersadda.pdf
    • https://cdn.shopify.com/s/files/1/0434/3991/5175/files/kipupis.pdf
    • https://cdn.shopify.com/s/files/1/0429/3197/8403/files/80766098182.pdf
    • https://cdn.shopify.com/s/files/1/0431/1236/6229/files/55960525291.pdf
    • https://cdn.shopify.com/s/files/1/0438/4142/1472/files/20122775540.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_off00008562.bin
7e5835a0a01e3a9ab86440314ad736e63de5f5c06bf8fcf9e6eff15d03481182		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8562 5392 bytes
font_01_sfnt_off000097b2.bin
c5b44c39a9a7eedb1bf08d0a103d8bdead0ddfa2737f7cdb473ba1656c20781a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97B2 9872 bytes

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