Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb5dcaef4736944d…

MALICIOUS

PDF

46.0 KB Created: 2020-10-29 05:47:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: b09f849a88894769a94982cc103479cf SHA-1: 2d06e0e109fcccede1f1b6be45bb6e61af0b9e43 SHA-256: fb5dcaef4736944d3320537c4858038622c1abb54818d36612ad2fb200920010
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a mass of external links, many pointing to redirector infrastructure, indicating a link farm or phishing lure. The primary URL, 'https://gettraff.ru/strik?keyword=origami+elephant+printable+instructions', is flagged as malicious. The document body, though heavily obfuscated, contains this URL and appears to be a lure for users seeking origami instructions. The ML classifier strongly supports the malicious verdict.

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://gettraff.ru/strik?keyword=origami+elephant+printable+instructions In PDF document text
    • https://radutarogo.weebly.com/uploads/1/3/4/3/134379411/3338.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/porukofosu.pdfIn PDF document text
    • https://lekinowi.weebly.com/uploads/1/3/4/4/134476644/libikuwo.pdfIn PDF document text
    • https://rikisuluwujufa.weebly.com/uploads/1/3/1/4/131452938/bogirisekede_mexelasutezovi.pdfIn PDF document text
    • https://zofigaxukinepir.weebly.com/uploads/1/3/4/2/134235574/xelugaviloxeni.pdfIn PDF document text
    • https://gujodoludota.weebly.com/uploads/1/3/2/6/132681740/55e981990d636.pdfIn PDF document text
    • https://rimesozarabef.weebly.com/uploads/1/3/1/6/131607712/39042860.pdfIn PDF document text
    • https://sisodiwitamusoz.weebly.com/uploads/1/3/2/6/132681746/sixolasofatu.pdfIn PDF document text
    • https://daxuregivav.weebly.com/uploads/1/3/4/4/134431970/2204388.pdfIn PDF document text
    • https://vidigesiwixir.weebly.com/uploads/1/3/3/9/133997627/laxubogo.pdfIn PDF document text
    • https://saxuvelimeno.weebly.com/uploads/1/3/4/4/134480096/2502a9d.pdfIn PDF document text
    • https://melegejisud.weebly.com/uploads/1/3/1/3/131379421/laxogu.pdfIn PDF document text
    • https://lefedatit.weebly.com/uploads/1/3/0/7/130776734/4821008.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/1/0477/2265/9996/files/42328508051.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/daniel_boorstin_los_creadores.pdfIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/vadosaselav.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/8924/7399/files/45985649103.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5027/7791/files/duvuxifa.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/st_john_the_baptist_church_smithton_illinois.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/2141/3785/files/basic_reliability_engineering_analysis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/8982/6460/files/user_stories_examples_with_acceptance_criteria.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0625/4504/files/round_cake_cutting_guide.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000071b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71B4 5516 bytes
SHA-256: a2e283419b7c3c165b1276cea40507c5695bfb5a46016243561b2f81de9465cb
font_01_sfnt_off0000843f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x843F 11152 bytes
SHA-256: c06386670f39f7612b9b9ad11f0c4e203c6f9712bc102c0b93ee8ce2a22c29ec

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