Malicious PDF — malware analysis report

Static analysis result for SHA-256 34d08c958f2af026…

MALICIOUS

PDF

49.8 KB Created: 2020-08-19 16:58:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 332d80aac557e1f85b5e0ca546d059ab SHA-1: 5c15e5554605536d90ea3daad1de551f4015e0af SHA-256: 34d08c958f2af02698616373fcaf2f78323e60ccc8ea7296b3fd4ddeee27c5e4
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/pify?keyword=refresh+page+after+form+submit+angular'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, including one to 'https://cdn.shopify.com/s/files/1/0432/7741/8651/files/tewaje.pdf'. The ML classifier strongly flagged this PDF as malicious. The document body, though partially corrupted, contains the same redirect URL, reinforcing the malicious intent.

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=refresh+page+after+form+submit+angular
    • http://files.arelationshipcounselingcenter.com/uploads/1/3/1/6/131637839/2a8ffa5.pdf
    • http://files.authormichaelduncan.com/uploads/1/3/1/3/131383864/vegumatonof.pdf
    • http://files.aubreyjardine.com/uploads/1/3/0/7/130776220/kezejix.pdf
    • http://files.wesmillermusiclessons.com/uploads/1/3/2/6/132682929/2043623.pdf
    • http://files.authorcaseypeeler.com/uploads/1/3/0/7/130740349/534dc711a6ca2a.pdf
    • https://cdn.shopify.com/s/files/1/0432/7741/8651/files/tewaje.pdf
    • https://cdn.shopify.com/s/files/1/0433/6674/4216/files/free_banting_recipes.pdf
    • https://cdn.shopify.com/s/files/1/0436/0847/3763/files/verbal_ability_books_for_gate.pdf
    • https://cdn.shopify.com/s/files/1/0435/3317/2885/files/10747811046.pdf
    • https://cdn.shopify.com/s/files/1/0428/2161/5775/files/580169519.pdf
    • https://cdn.shopify.com/s/files/1/0433/7546/0517/files/edit_text_editor.pdf
    • https://cdn.shopify.com/s/files/1/0434/8359/4917/files/37251997143.pdf
    • https://cdn.shopify.com/s/files/1/0432/3383/7219/files/strategic_management_accounting_zahirul_hoque.pdf
    • https://cdn.shopify.com/s/files/1/0433/1782/1605/files/62141952887.pdf
    • https://cdn.shopify.com/s/files/1/0431/6794/0765/files/27096048236.pdf
    • https://cdn.shopify.com/s/files/1/0434/0717/9941/files/20440296358.pdf
    • https://cdn.shopify.com/s/files/1/0435/6043/5873/files/1737748339.pdf
    • https://cdn.shopify.com/s/files/1/0428/7456/8860/files/geziwivutabug.pdf
    • https://cdn.shopify.com/s/files/1/0437/7139/6257/files/23267014051.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_off00006416.bin
2fcf847c6fa67db5db2a56fff7b6b12df71424c01c320d88f1eacb9e62f3db2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6416 5344 bytes
font_01_sfnt_off00007621.bin
039654dcfab0e0b792a6f432f9898b15a5c60a2638231a200ac1a831fb2141d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7621 16532 bytes
font_02_sfnt_off0000a9f8.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA9F8 4324 bytes

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