Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac81d6b841a27370…

MALICIOUS

PDF

96.9 KB Created: 2020-08-04 04:19:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e723bdc740a51f0b5841c98062924fa6 SHA-1: e0eea88490a684b8362a09bf8db012dce4e51473 SHA-256: ac81d6b841a273703ab3ea0b2bfb4e6f34d15f7f1cef6290f940830dc4185e95
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a download for 'Warhammer armies bretonnia pdf'. The ML classifier strongly indicates maliciousness, and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the presence of a link to known malicious infrastructure. The document body, though heavily obfuscated, contains the target URL, suggesting the primary goal is to redirect the user to a malicious site.

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.cc/pify?keyword=warhammer+armies+bretonnia+pdf
    • http://files.annagalatirealtor.com/uploads/1/3/0/7/130776718/979473.pdf
    • http://files.jessicaharperyoga.com/uploads/1/3/1/6/131606727/1298821.pdf
    • http://files.premierprescotthomes.com/uploads/1/3/1/6/131637763/gukesove.pdf
    • http://files.onlineradioschool.com/uploads/1/3/2/6/132682974/1070f3a793.pdf
    • http://files.getdropmint.com/uploads/1/3/1/0/131070212/sozalo-bowin-demoniloxev-sepibaxa.pdf
    • https://cdn.shopify.com/s/files/1/0430/6193/6290/files/jorutelokadov.pdf
    • https://cdn.shopify.com/s/files/1/0434/6934/0822/files/28244258952.pdf
    • https://cdn.shopify.com/s/files/1/0429/3004/5084/files/lijaxawuwumulorukileb.pdf
    • https://cdn.shopify.com/s/files/1/0433/9073/0398/files/webumowajo.pdf
    • https://cdn.shopify.com/s/files/1/0436/2479/2224/files/43227143431.pdf
    • https://cdn.shopify.com/s/files/1/0437/7382/1082/files/rofatilinadawopogu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1220/2389/files/2014_vw_jetta_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/6753/0655/files/surimipi.pdf
    • https://cdn.shopify.com/s/files/1/0438/4453/4429/files/benefits_of_computerized_accounting_system.pdf
    • https://cdn.shopify.com/s/files/1/0431/8344/0030/files/46257921543.pdf
    • https://cdn.shopify.com/s/files/1/0430/6855/5415/files/javamimupoguvarurowube.pdf
    • https://cdn.shopify.com/s/files/1/0431/7757/4551/files/7515533387.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/39007814457.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_off00013a12.bin
3d8471f3e8a8337bdaec9c84633e93e91f6882a98f5733fcdd509656c47039ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A12 5400 bytes
font_01_sfnt_off00014c4e.bin
010745f1ec389cd37e6785fae3aaf0c2ef0f6d483911f6fc8a294038320cdbdc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14C4E 13192 bytes

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