Malicious PDF — malware analysis report

Static analysis result for SHA-256 09a4b53409bfc4a3…

MALICIOUS

PDF

39.7 KB Created: 2020-08-27 15:16:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2761f45e6d565ce7d1864bada9ad6e89 SHA-1: 82c0f8fd948a9c42ec9db061c6e538daf1778f19 SHA-256: 09a4b53409bfc4a30166f19c6c2125a9c21e5f8734d693ad0db80d4a582d6505
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'https://ttraff.cc/pify?keyword=the+grammar+book+3rd+edition'. This indicates the document's primary purpose is to redirect users to malicious sites, likely for further exploitation or phishing. No scripts were extracted, but the presence of embedded URLs and the redirector link strongly suggest a malicious intent.

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=the+grammar+book+3rd+edition
    • http://files.projectsforwildlife.com/uploads/1/3/1/8/131857315/kanabekox.pdf
    • http://files.susanwardbooks.com/uploads/1/3/0/8/130814535/f5eb4a020e5c0c.pdf
    • http://files.dotasata.com/uploads/1/3/2/6/132696155/4915173.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0427/9726/9159/files/hida_brownian_motion.pdf
    • https://cdn.shopify.com/s/files/1/0431/6377/9236/files/puxedipetu.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/adjective_clause_grammar.pdf
    • https://cdn.shopify.com/s/files/1/0435/2334/2495/files/timokomexow.pdf
    • https://cdn.shopify.com/s/files/1/0463/2595/6765/files/miracles_performed_by_benson_idahosa.pdf
    • https://cdn.shopify.com/s/files/1/0435/0597/5462/files/eureka_quest_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/4107/1016/files/aurumscience_switch_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0437/4636/1505/files/botulismo_2020.pdf
    • https://cdn.shopify.com/s/files/1/0437/7152/7330/files/computer_system_architecture_in_os.pdf
    • https://cdn.shopify.com/s/files/1/0431/0073/3596/files/jeletelodonu.pdf
    • https://cdn.shopify.com/s/files/1/0436/1453/5843/files/learning_english_grammar_book.pdf
    • https://cdn.shopify.com/s/files/1/0429/7159/4911/files/lotadimudelorokovurixam.pdf
    • https://cdn.shopify.com/s/files/1/0438/2264/5408/files/1784966786.pdf
    • https://cdn.shopify.com/s/files/1/0434/5289/1297/files/school_application_letter_format.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_off00005191.bin
7ff5ab32f0d0ab24528cbf6f2124ee79203b27dbc499fccee5b171a5f1fc4adc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5191 5132 bytes
font_01_sfnt_off000062da.bin
7c9058be272faf050db7dbb747cf9e283c98488237614348f39e84349ee542b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62DA 9688 bytes
font_02_sfnt_off000083e2.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83E2 4324 bytes

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