Malicious PDF — malware analysis report

Static analysis result for SHA-256 43fe04bfc2cd6d94…

MALICIOUS

PDF

43.3 KB Created: 2020-08-15 19:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f32c3803d623d32c959a0d0263c1211 SHA-1: 18bfb0633045936fb9991d1e28f93e7bbfcf0215 SHA-256: 43fe04bfc2cd6d9427dd874fc9757bd5b30c7d56b328677690791dd93e9e7a33
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, which is indicative of a link farm used to obscure malicious redirectors. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically identifies a link to ttraff.ru, a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the URL that is also flagged as a malicious redirector.

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/wb?keyword=daily%20schedule%20planner%20pdf
    • http://files.tkdonlineregistration.com/uploads/1/3/2/3/132303378/bevodineg_xitudosesivono_sutifoguv_kabarobanevusot.pdf
    • http://files.mosim.org/uploads/1/3/2/3/132302993/5476439.pdf
    • http://files.davidkaid.com/uploads/1/3/1/3/131381103/2983191.pdf
    • http://files.fathertomsmission.org/uploads/1/3/1/0/131070508/8416985.pdf
    • http://files.tkdonlineregistration.com/uploads/1/3/2/3/132303378/bevodineg_xitud
    • https://cdn.shopify.com/s/files/1/0433/9482/6405/files/betofibowamozawo.pdf
    • https://cdn.shopify.com/s/files/1/0433/4013/6601/files/ms_market_bulletin.pdf
    • https://cdn.shopify.com/s/files/1/0440/4668/0214/files/scorebuilders_pt_exam_book.pdf
    • https://cdn.shopify.com/s/files/1/0430/9811/2167/files/94991752731.pdf
    • https://cdn.shopify.com/s/files/1/0433/8037/5704/files/libasinekogogirifej.pdf
    • https://cdn.shopify.com/s/files/1/0437/4292/0869/files/satasoxapoxid.pdf
    • https://cdn.shopify.com/s/files/1/0430/5793/8581/files/ten_plagues_of_egypt_worksheet_ks2.pdf
    • https://cdn.shopify.com/s/files/1/0432/3124/8542/files/xifagakabigub.pdf
    • https://cdn.shopify.com/s/files/1/0434/1042/3960/files/playstation_2_games_apk.pdf
    • https://cdn.shopify.com/s/files/1/0431/4991/8362/files/free_birthday_gift_voucher_template_uk.pdf
    • https://cdn.shopify.com/s/files/1/0435/4228/2399/files/kebesi.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_off00006b18.bin
d5564076f212c5a239b7990bb47d04b2487a586a03c7cc027811de84a1567ce9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B18 5344 bytes
font_01_sfnt_off00007d3f.bin
09cbcb5d40ee6a51f74182ef6ba3574197d11550fd0469dfd959047161e24088		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D3F 10148 bytes

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