Malicious PDF — malware analysis report

Static analysis result for SHA-256 86da0de53bc2ac5e…

MALICIOUS

PDF

49.3 KB Created: 2020-10-28 02:49:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 232f7662f18d254df0f7152c9bb975c1 SHA-1: e0d2b3d1be8c26fcd49a46162d282b1f7d9eef9b SHA-256: 86da0de53bc2ac5e12704af597ddddd3b0ddcf0abd62c88e9cce073be0a63671
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to benign Shopify URLs, but one prominent link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the text 'Algebra 2 unit 1 test answer key' and the malicious URL, suggesting a lure to trick users into clicking the link. The presence of embedded URLs and the ML classification strongly indicate malicious intent, likely to redirect users to further malicious content 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://gettraff.ru/123?keyword=algebra+2+unit+1+test+answer+key In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365639/normal_5f8e09e013676.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377112/normal_5f9657644fd8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366407/normal_5f9816ef791df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382948/normal_5f980cbf35cba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367640/normal_5f977627d8ab0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366388/normal_5f8ec220ca0e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369518/normal_5f8a8e4b07879.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365653/normal_5f86fad7bd477.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/1/0428/5435/1015/files/81979679393.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/1952/4036/files/59686261452.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/4986/4353/files/6615831476.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0461/8122/0505/files/food_fantasy_catacombs_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8970/0027/files/jiwoluwodojoxakizusol.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/angular_8_tutorial_franais.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/5284356334.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/los_fisiocratas_economia.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/complete_key_student_s_book.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/18364225845.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/21907098144.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/52261951275.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/learning_javascript_design_patterns_download.pdfIn PDF document text
    • https://s3.amazonaws.com/punagilelabon/77450811919.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_off00007fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FCD 5424 bytes
SHA-256: b85820e3a841959b286d1f16e618cff423eebeb50fad21f40494dce0f9da1abc
font_01_sfnt_off00009272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9272 11024 bytes
SHA-256: 472830e07f5b3538e5479127aab975ecc47243720fd50e66b5386b1b89e679a0

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