Malicious PDF — malware analysis report

Static analysis result for SHA-256 606e0524f03a61a2…

MALICIOUS

PDF

52.5 KB Created: 2020-10-31 09:39:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 325e839776fdde3afd494f27f6d549bf SHA-1: 6a48966820289610e741a6d51236fa0429f3d82d SHA-256: 606e0524f03a61a2f33317dbdd4cbd813a4d32c81b2b34f4235aca4f55579e9c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the critical heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The ML classifier also strongly indicated maliciousness. The primary IOC is the redirector URL, which is likely used to host or deliver further malicious content.

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.com/123?keyword=sd+maid+pro In PDF document text
    • https://cdn-cms.f-static.net/uploads/4419650/normal_5f9a082914b40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371790/normal_5f8da226a6837.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413458/normal_5f94323fa5e0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379384/normal_5f8a907374978.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384167/normal_5f8c894370ae1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368466/normal_5f879aea46bf8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376619/normal_5f8c13614aff7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369640/normal_5f8ea367c926f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/4980/2664/files/messing_with_the_enemy_clint_watts.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1478/2104/files/fadamazuguwidew.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0510/6139/1525/files/faduzofawimutuxuduzilefut.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/4595/9845/files/taste_of_korea.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/93152965585.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/7619/5752/files/android_studio_kotlin_code_coverage.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/5755/6903/files/55327891321.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D76 4996 bytes
SHA-256: f32164633099834e2aa14e82bed9ff60d2e2e41ae44781b8ebd7f1025211cf99
font_01_sfnt_off00007e53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E53 2116 bytes
SHA-256: 1f756b46481ac718095810e133e155ec1caf818687d25c20e8b002f727d713c7
font_02_sfnt_off000087ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87FF 11224 bytes
SHA-256: 123742e9a163479478a7a6453a79de94d616374c80e9ff39b9969a9ce1eed3bd
font_03_sfnt_off0000ae77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE77 16344 bytes
SHA-256: f3b95f1269985bafc3dfb9b5b35e76df8a4d57039a143c013aed99c7cf3a4a89

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