Malicious PDF — malware analysis report

Static analysis result for SHA-256 71bdcfe7aa95eb99…

MALICIOUS

PDF

67.8 KB Created: 2020-08-19 05:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b19ee3af2c83e3b9d5fbab1ec3c54b8 SHA-1: 92e99939448ac82e7c0494d0cc19e8a94031fe66 SHA-256: 71bdcfe7aa95eb993c9a3e866aabb15d36988aa18e82f1e1577dea09f9b61789
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ttraff.cc/pify?keyword=free+responsive+css+admin+template'. It also exhibits characteristics of a link farm, with numerous embedded links pointing to external PDF files, many hosted on Shopify. The document body, though heavily obfuscated, contains the same redirector URL, suggesting an attempt to lure users to potentially malicious content under the guise of a free resource.

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=free+responsive+css+admin+template
    • http://files.kikinaart.com/uploads/1/3/1/3/131383651/xakigunuxexosopaso.pdf
    • http://files.ulverstonoutsiders.org/uploads/1/3/0/7/130775197/3a226dd77b5754.pdf
    • http://files.usfitnessfreaks.com/uploads/1/3/1/0/131070973/sidizip_ronuwiv_velosadogi_mebowa.pdf
    • http://susubomen.ghsmustangvolleyball.com/uploads/1/3/1/3/131382134/liwufaramuzefi_nufadavag_sefusepa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/3071/5288/files/xowokadovuvupasokesedanu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6987/4082/files/22812461840.pdf
    • https://cdn.shopify.com/s/files/1/0454/5445/9030/files/sivivuvexefiwanazutatutu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4603/4853/files/61472689679.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ruxejuvekega.pdf
    • https://cdn.shopify.com/s/files/1/0436/1191/4403/files/ruloseb.pdf
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/moko_hibachi_google_reviews.pdf
    • https://cdn.shopify.com/s/files/1/0431/2901/2381/files/modubazipagazekok.pdf
    • https://cdn.shopify.com/s/files/1/0429/3869/5846/files/easy_learning_english_verbs.pdf
    • https://cdn.shopify.com/s/files/1/0433/4492/0734/files/99595623271.pdf
    • https://cdn.shopify.com/s/files/1/0431/8307/9584/files/59562289837.pdf
    • https://cdn.shopify.com/s/files/1/0429/0805/7759/files/cheap_trick_mighty_wings.pdf
    • https://cdn.shopify.com/s/files/1/0434/4188/1253/files/campbell_biology_11th_edition_reddit.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdfa.bin
8b74f245441a0c9ebd8a77ddb3c17515e84f1300b8d9becdbee1fafb40e922e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFA 5232 bytes
font_01_sfnt_off0000dfb6.bin
790ad504a49a99bab9be22c72a5a8e88104faa100e5b2d351fea02a13665dbe3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB6 10012 bytes

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