Malicious PDF — malware analysis report

Static analysis result for SHA-256 73fb17cf268a8d50…

MALICIOUS

PDF

41.9 KB Created: 2020-08-22 12:36:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c05e4e87d89953fe10598e8545265f6e SHA-1: 9631972caafda91693b17c47e7ce1d6862cd6b68 SHA-256: 73fb17cf268a8d50172c6ae98eaffbadafb5109d6dacdb76239f95b5a67bf1e9
154 Risk Score

Malware Insights

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

The PDF contains embedded links and text that direct users to a redirector URL, masquerading as a "secure boot error" for Android. The ML classifier and heuristic firings strongly indicate malicious intent, likely to lead users to further malicious content or phishing pages. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to exploit user trust through a deceptive lure.

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=secure+boot+error+android
    • http://kidifolem.coastguardmaraetai.org/uploads/1/3/2/6/132681670/zinepigotofi_rusalu_raged_nubedota.pdf
    • http://files.ilovesmiley.com/uploads/1/3/1/4/131453213/4128176.pdf
    • http://zarikit.wicknscents.com/uploads/1/3/2/8/132815806/pafepimamuwoxi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/1231/6584/files/zolpidem_monograph.pdf
    • https://cdn.shopify.com/s/files/1/0438/2756/0610/files/table_html_template_css.pdf
    • https://cdn.shopify.com/s/files/1/0437/7152/7325/files/336624051.pdf
    • https://cdn.shopify.com/s/files/1/0440/3717/7494/files/vaxupezajoxolavosafaful.pdf
    • https://cdn.shopify.com/s/files/1/0430/6383/6834/files/rutegososojozelekiwumori.pdf
    • https://cdn.shopify.com/s/files/1/0452/2449/3213/files/best_cheap_android_phone_uk_2018.pdf
    • https://cdn.shopify.com/s/files/1/0429/5920/8604/files/wireless_communications_principles_and_practice.pdf
    • https://cdn.shopify.com/s/files/1/0431/6489/3345/files/subtraction_with_regrouping_worksheets_for_grade_2.pdf
    • https://cdn.shopify.com/s/files/1/0439/5833/7694/files/glossary_of_law_terms.pdf
    • https://cdn.shopify.com/s/files/1/0428/5412/1635/files/math_expressions_homework_book_answers.pdf
    • https://cdn.shopify.com/s/files/1/0440/3465/4358/files/editable_debit_card_template.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_off0000675a.bin
951377cb7ac77c0de62b61d6a8e717fde8cf32c07672addb55a75382cc000025		 pdf-font-stream PDF embedded font (sfnt) at offset 0x675A 4964 bytes
font_01_sfnt_off0000783c.bin
6264de6a8e637678ea116bc379e9ccf7ddd702fa5741467c03c4d748be6c65c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x783C 9996 bytes

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