Malicious PDF — malware analysis report

Static analysis result for SHA-256 523ff61a32a089c6…

MALICIOUS

PDF

50.3 KB Created: 2020-08-05 12:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10bd4f274f40ac38463e2cbd19418697 SHA-1: 7b5f64ad175a5f711ef6460be8cf963e20d11d5d SHA-256: 523ff61a32a089c6febda1246583bc5f4eff7560e23af57a5a47ba2e1289b92a
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains text that appears to be a lure for a specific PDF title, likely to entice clicks on the embedded malicious link. No scripts were extracted, but the PDF structure itself is used for the malicious redirection.

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=bidayatul+mujtahid+arabic+pdf
    • http://files.darrenroesch.com/uploads/1/3/1/3/131380730/3816198.pdf
    • http://files.andersoncontemporary.com/uploads/1/3/1/8/131856852/fegozazukunok-dizawasumen-favokuxike-lefom.pdf
    • http://files.annasiantrading.com/uploads/1/3/0/9/130969346/9257853.pdf
    • http://files.bluethunderbirdwoman.com/uploads/1/3/1/8/131871780/5388329.pdf
    • https://cdn.shopify.com/s/files/1/0429/3738/5123/files/97887566655.pdf
    • https://cdn.shopify.com/s/files/1/0433/4472/4133/files/kifizovirafuwuxakotosafi.pdf
    • https://cdn.shopify.com/s/files/1/0429/6795/7658/files/tavixawejipenawupasedawaf.pdf
    • https://cdn.shopify.com/s/files/1/0432/3888/3485/files/3904726248.pdf
    • https://cdn.shopify.com/s/files/1/0434/1301/2641/files/gefokavegiviremiwetov.pdf
    • https://cdn.shopify.com/s/files/1/0433/5704/4890/files/bebegexibivov.pdf
    • https://cdn.shopify.com/s/files/1/0432/2541/5843/files/ily_urban_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/33066004051.pdf
    • https://cdn.shopify.com/s/files/1/0431/6993/9612/files/guton.pdf
    • https://cdn.shopify.com/s/files/1/0430/9906/2421/files/96680108694.pdf
    • https://cdn.shopify.com/s/files/1/0432/2924/9694/files/falling_leaves.pdf
    • https://cdn.shopify.com/s/files/1/0428/5313/8591/files/godokalebalexivus.pdf
    • https://cdn.shopify.com/s/files/1/0428/9665/4489/files/boximuxilirinuwes.pdf
    • https://cdn.shopify.com/s/files/1/0432/6329/5654/files/wupoluxozivalesakel.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_off000059f5.bin
7c493fe25ae6d1bdaaa74310e4358e4bc1681c43f80a8aac75857cbb012ae6d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59F5 5584 bytes
font_01_sfnt_off00006cd1.bin
53210e90d555ab7814696eee7931dc1d57a02e6259d77f584c036d1eeee48139		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CD1 17136 bytes
font_02_sfnt_off00009fea.bin
0542888f6aa338f9b6c974dfea6aea19161095a3fcdc5c1d41f74c423bbfbcea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FEA 18116 bytes

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