Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bb8f6435234b5dc…

MALICIOUS

PDF

47.3 KB Created: 2020-09-01 05:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31dca81c782e0e4124f2b3ca1b491d21 SHA-1: c78f616a7f6a82e5f1ef279c07a73fec77da5ff3 SHA-256: 5bb8f6435234b5dc2a1f2b0c6735ac8523542587b5e0853cc36e7ef44a82a940
194 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. It also exhibits characteristics of an SEO link farm, embedding numerous links, many of which are benign Shopify URLs but one is a known malicious redirector. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure for a free download, consistent with credential phishing or redirection to malicious sites. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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/wix?keyword=vscocam+fullpack+ios+gratis
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/8667/4088/files/basic_rules_of_mathematics_algebra.pdf
    • https://cdn.shopify.com/s/files/1/0437/4410/0506/files/50277587731.pdf
    • https://cdn.shopify.com/s/files/1/0431/1895/2612/files/lubelebefi.pdf
    • https://cdn.shopify.com/s/files/1/0434/3873/5512/files/simerifire.pdf
    • https://cdn.shopify.com/s/files/1/0428/3380/5471/files/46792251792.pdf
    • https://cdn.shopify.com/s/files/1/0435/5656/9249/files/zejolozadosukofuleje.pdf
    • https://cdn.shopify.com/s/files/1/0461/5520/2723/files/graphing_and_properties_of_hyperbolas_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/6043/6896/files/bujorepujusoxaj.pdf
    • https://cdn.shopify.com/s/files/1/0433/5606/1850/files/48026533166.pdf
    • https://cdn.shopify.com/s/files/1/0428/1165/4307/files/physical_assessment_form_nursing_students.pdf
    • https://cdn.shopify.com/s/files/1/0429/8083/5482/files/basic_knowledge_of_computer_file.pdf
    • https://cdn.shopify.com/s/files/1/0430/4207/8877/files/vupojiporutazapeda.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/12457093378.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tivaluzisezulumavolo.pdf
    • https://cdn.shopify.com/s/files/1/0439/6272/8606/files/48253058110.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5797/files/cours_anglais_bac.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8865/files/31377022733.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/96989945255.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e0e.bin
284074352cacfb576eb0dfd38568f3daaa5c64e30b12658de4bf5216476c740a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E0E 5364 bytes
font_01_sfnt_off0000803f.bin
fc4021e369c7333a3e2698b65512cd5ca33aa0a3949f6c925ad90d66ca89f0ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x803F 2528 bytes
font_02_sfnt_off00008b70.bin
0fa05645554549d74ab89c76e1e2d35b3cac2692d595de6a84babcd609efd531		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B70 10456 bytes

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