Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fba81dcc7bcef7a…

MALICIOUS

PDF

38.4 KB Created: 2020-07-22 06:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07f5897720f56e94f319a18145b7a9cd SHA-1: e03eb023de75ebaa61b0c3766d7e599c5d157ccd SHA-256: 5fba81dcc7bcef7a7b63f88975d752f532e28f3713248d47f11f3c2e14034c38
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, masquerading as a service manual to entice clicks. One of the primary links, 'https://ttraff.com/pify?keyword=briggs+and+stratton+450+service+manual+pdf', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create SEO spam or phishing pages.

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/pify?keyword=briggs+and+stratton+450+service+manual+pdf
    • http://files.swallowthesea.com/uploads/1/3/1/4/131438308/veregibikoruve_vaxatit_munabuv.pdf
    • http://files.badcredentials.com/uploads/1/3/0/8/130815014/mugatusedaji_bofuralulomarix_gikeliwevasuzi.pdf
    • http://files.camera1.ca/uploads/1/3/1/3/131380413/pizixejawij.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/3359/8880/files/69886015113.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/88075317933.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/75815848510.pdf
    • https://cdn.shopify.com/s/files/1/0433/9728/3992/files/90582143946.pdf
    • https://cdn.shopify.com/s/files/1/0441/1876/9816/files/jekit.pdf
    • https://fanevuwavos.files.wordpress.com/2020/07/kagudamasexemokuf.pdf
    • https://fumeperotozu.files.wordpress.com/2020/07/wisozapevedizorutip.pdf
    • https://kemekakusava.files.wordpress.com/2020/06/jemufufidisevexumabebago.pdf
    • https://retutike.files.wordpress.com/2020/07/90373269475.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jakenetukuzalavat.pdf
    • https://cdn.shopify.com/s/files/1/0433/0805/6740/files/mudutimuko.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kividerinogofigizunewif.pdf
    • https://cdn.shopify.com/s/files/1/0430/8343/2096/files/xowekiweserazajamu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6640/0663/files/86656666849.pdf
    • https://cdn.shopify.com/s/files/1/0440/4012/6614/files/37332321463.pdf
    • https://cdn.shopify.com/s/files/1/0428/0346/2303/files/15323204808.pdf
    • https://cdn.shopify.com/s/files/1/0432/3108/4701/files/3156251517.pdf
    • https://cdn.shopify.com/s/files/1/0433/6254/9910/files/vunatijeza.pdf
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/8146403541.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_off0000593c.bin
60c111b8f80a1c6288d5b75003abc7b2354e312cb5c2b8772787ba6206313d86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x593C 5820 bytes
font_01_sfnt_off00006d02.bin
7d8a89adea3f0997c61b0e42b1ed674ed0cd7e059575deae26460f8f342a0b6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D02 9120 bytes

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