Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c39587f3b5ee197…

MALICIOUS

PDF

50.3 KB Created: 2020-08-30 02:41:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 625e060e999843ca348f98fedbcbf0ae SHA-1: 8d0d391b8b29c788ad70e491fce3ae7d63bdb364 SHA-256: 5c39587f3b5ee197272e3e8dc00d41a13a7a14a9a700a9c8c078fdd725729f93
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body and embedded links suggest an attempt to direct users to potentially harmful content, possibly for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and link farm indicate a malicious intent to redirect users.

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/wix?keyword=michael+nielsen+deep+learning
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7030/0065/files/windows_8._1_product_key.pdf
    • https://cdn.shopify.com/s/files/1/0431/0820/4704/files/vukofimozisojo.pdf
    • https://cdn.shopify.com/s/files/1/0437/4075/8170/files/.pdf
    • https://cdn.shopify.com/s/files/1/0438/2910/0701/files/icas_maths_paper_f_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/9183/6566/files/wusarewodasojoxewogizejub.pdf
    • https://cdn.shopify.com/s/files/1/0428/8125/3535/files/st_benilde_scholarship_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0428/8489/0790/files/bin_sachivalay_clerk_book_pdf_download_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/2823/3885/files/24557797746.pdf
    • https://cdn.shopify.com/s/files/1/0432/6778/4864/files/consumer_reports_shark_vacuum_cleaners.pdf
    • https://cdn.shopify.com/s/files/1/0436/1335/6194/files/giwadudana.pdf
    • https://cdn.shopify.com/s/files/1/0431/6574/5309/files/analgesik_obat.pdf
    • https://cdn.shopify.com/s/files/1/0432/4176/7072/files/49849168605.pdf
    • https://cdn.shopify.com/s/files/1/0431/0378/1013/files/noguvev.pdf
    • https://cdn.shopify.com/s/files/1/0449/0277/6999/files/home_budget_template_uk.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066f0.bin
0888d23138092ab81752dbefad56820be65b6ae3009e7ca8226ef22a8945bc64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66F0 2896 bytes
font_01_sfnt_off00007132.bin
0be2ba8a25d79e9aaeedf62bbea1e309647a854a1f71ccd2243c72b2c41a2333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7132 5340 bytes
font_02_sfnt_off0000834e.bin
417125fdffb964fa04d136959ca9e9e689fd75d402cb1a6a3c19b2e2e0bd8515		 pdf-font-stream PDF embedded font (sfnt) at offset 0x834E 10192 bytes
font_03_sfnt_off0000a66c.bin
64d7204b7c904b600158d10e0b8dfc2ac39b7db43a904f501a21ebbf7969b576		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA66C 16144 bytes

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