Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7ac326640a25fb4…

MALICIOUS

PDF

48.9 KB Created: 2020-09-18 06:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9b7cb11d40433d38ac344c960a4312a SHA-1: 832b3d878e312ae3364e3202c7b99865c789fcc6 SHA-256: f7ac326640a25fb4751b08bed16b5263aabeb2e3005f04011a2733ec04a8e4f9
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Phishing: Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The heuristic PDF_SEO_LINK_FARM indicates a mass external PDF link farm, suggesting the document's primary purpose is to distribute links, potentially for SEO manipulation or to lead users to malicious sites. The ML classifier strongly supports the malicious nature of this PDF.

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.link/wix?keyword=history+3+make+our+days+count+ao3
    • https://cdn.shopify.com/s/files/1/0431/5938/8320/files/80429854304.pdf
    • https://cdn.shopify.com/s/files/1/0437/9652/9314/files/34761735406.pdf
    • https://cdn.shopify.com/s/files/1/0434/1284/8790/files/534517253.pdf
    • https://cdn.shopify.com/s/files/1/0438/8729/6680/files/59279212558.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/65326233819.pdf
    • https://cdn.shopify.com/s/files/1/0436/1306/1277/files/93697398755.pdf
    • https://cdn.shopify.com/s/files/1/0431/5460/4198/files/84895412147.pdf
    • https://cdn.shopify.com/s/files/1/0434/7206/0573/files/zakavafuzobiwex.pdf
    • https://afbe54db-643f-44ac-9619-f034d99a220d.filesusr.com/ugd/1cc7e8_c08b8e7f98bf4b58a026ba22efd7a60d.pdf?index=true
    • https://40206508-7530-4f19-a35a-2dc4e72aec97.filesusr.com/ugd/89b1bc_7816ec9daaf9461fa0eee76be5b500ee.pdf?index=true
    • https://ea83dd9d-4f39-4fec-ae8f-c65034616ced.filesusr.com/ugd/2d1648_a0de6148ddd44373b643c67861fa62cf.pdf?index=true
    • https://19009227-0075-4c68-a212-e984f67ea548.filesusr.com/ugd/501a20_783c543bd8464e17b1baf8df808f85ce.pdf?index=true
    • 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_off000076b3.bin
218615c96ca80467247facc766f9c2f2584948c92711c8aede41886f3cdaaaab
pdf-font-stream PDF embedded font (sfnt) at offset 0x76B3 2984 bytes
font_01_sfnt_off00008162.bin
7a89d972e119dacf6e614b3213ce27ae17c3020dc17cc7d78bd62b6e3a89df12
pdf-font-stream PDF embedded font (sfnt) at offset 0x8162 5344 bytes
font_02_sfnt_off0000937a.bin
5be0030942bf159193a3896c95bcc0caa0e61dff75a12a7307ae7259911281b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x937A 10236 bytes