Malicious PDF — malware analysis report

Static analysis result for SHA-256 1108d5eb58f7b448…

MALICIOUS

PDF

44.9 KB Created: 2020-08-22 05:12:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f49df89f7139f9f1eb502e190501b7c4 SHA-1: 0823f37e0015653b7d06539b606e62ed7e0a89e6 SHA-256: 1108d5eb58f7b448eb6499871511740d6073cee40f5a509c8a833d14f0d40975
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though obfuscated, contains text related to 'personal finance worksheet answers' and a URL pointing to a redirector. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent. The presence of multiple external links, many pointing to PDF files, suggests a link farm or redirection strategy to distribute malicious content.

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.ru/pify?keyword=personal+finance+worksheet+answers
    • http://larefafub.melodyarabo.com/uploads/1/3/0/7/130775432/bewazunom_dopokididupiro.pdf
    • http://files.lilianaduque.com/uploads/1/3/1/8/131856672/2390272.pdf
    • http://xepezep.millsriver.org/uploads/1/3/0/8/130813669/junilikanefexom_werifugupudex.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0438/9270/3384/files/puzzle_questions_for_interview_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/2285/9943/files/zowotimotavubufojiguk.pdf
    • https://cdn.shopify.com/s/files/1/0431/5765/1613/files/reports_app_instagram_profile_stalkers.pdf
    • https://cdn.shopify.com/s/files/1/0432/0795/0495/files/xivogadelabetugok.pdf
    • https://cdn.shopify.com/s/files/1/0436/5749/4686/files/php_print_array.pdf
    • https://cdn.shopify.com/s/files/1/0431/5856/9115/files/50808035851.pdf
    • https://cdn.shopify.com/s/files/1/0436/1604/3168/files/shrimad_bhagwat_gita_in_sanskrit.pdf
    • https://cdn.shopify.com/s/files/1/0432/3947/3314/files/6792725890.pdf
    • https://cdn.shopify.com/s/files/1/0433/5593/0783/files/43042792739.pdf
    • https://cdn.shopify.com/s/files/1/0434/4355/2416/files/mujufifo.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_off0000659b.bin
e50df1d339886a3f4f9390bcdd6ba5883bc6809cfc6e068a577bc81a3b5fea2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x659B 4912 bytes
font_01_sfnt_off0000764b.bin
d199fd49afa0a3425c7226232f1e2cb1d554a414f76bf08548f0b6a380841b2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x764B 10064 bytes
font_02_sfnt_off000098b1.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98B1 4324 bytes

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