Malicious PDF — malware analysis report

Static analysis result for SHA-256 eef57b9558b1e5af…

MALICIOUS

PDF

41.1 KB Created: 2020-08-31 09:11:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 341d45377f29f4a326fd74d864eaf4f2 SHA-1: 5754d7ba0bff25052f5b7cb837148d20b593f0a8 SHA-256: eef57b9558b1e5afe05ec63de47e26aafe637f17d545a01e70d5caf314503c90
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. Another critical heuristic identified a large external PDF link farm, with many links hosted on cdn.shopify.com. The document body contains text related to 'Daniel and revelation study guide sd' and the URL 'https://ttraff.cc/wix?keyword=daniel+and+revelation+study+guide+sd' which likely serves as the primary malicious redirector.

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/wix?keyword=daniel+and+revelation+study+guide+sd
    • https://cdn.shopify.com/s/files/1/0437/7798/2626/files/carto_de_cnpj_em.pdf
    • https://cdn.shopify.com/s/files/1/0434/9889/7574/files/oxford_advanced_learner_s_english_chinese_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0437/5812/5213/files/factorio_4_lane_balancer.pdf
    • https://cdn.shopify.com/s/files/1/0431/0011/0999/files/wojajonugugowurelu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/26160609228.pdf
    • https://cdn.shopify.com/s/files/1/0430/8942/8637/files/denemakerujuzatojosexo.pdf
    • https://cdn.shopify.com/s/files/1/0431/4074/3329/files/guide_to_data_analysis_using_spss.pdf
    • https://cdn.shopify.com/s/files/1/0433/3309/1480/files/76403998296.pdf
    • https://cdn.shopify.com/s/files/1/0437/6195/9069/files/81182251580.pdf
    • https://cdn.shopify.com/s/files/1/0431/5296/5789/files/21687659843.pdf
    • https://static.usrfiles.com/ugd/3aee12_e34231df17824ebfbcc441b71855c2b3.pdf
    • https://static.usrfiles.com/ugd/c1de29_8d308e4051644b08b42dda34c34bc721.pdf
    • https://static.usrfiles.com/ugd/12f4eb_e189b03df570492fa86ffc3e7767e333.pdf
    • https://static.usrfiles.com/ugd/be19e1_80b51e1d244e458fb11cf4539beea783.pdf
    • https://static.usrfiles.com/ugd/b8c837_7fc9513cd8a3429c960734aaf5d32b0b.pdf
    • https://static.usrfiles.com/ugd/aef5b7_1293f6527b664baab0f153f273b3f922.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006216.bin
fdda660059ddad6ce2777ac3be35b8bb03f8fd3f1eeb7e7b8348bae9862ec23a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6216 5156 bytes
font_01_sfnt_off000073b9.bin
ed4cdb701aa9c7d46cb511dca4cea621280cdd27e64bf0fdb61210def74878b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73B9 10588 bytes

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