Malicious PDF — malware analysis report

Static analysis result for SHA-256 700c37dc5b168429…

MALICIOUS

PDF

33.9 KB Created: 2020-09-10 17:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0026f74e17adc51a593682120a6615fc SHA-1: 12d6df25c59e8bc91f633091b57a9cac5977c178 SHA-256: 700c37dc5b168429fb5e194423db8491259536b3b510ca017c94300d7cd2c747
170 Risk Score

Malware Insights

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

The PDF contains a lure for a "household expenditure form template" and embeds numerous links, including one to a known malicious redirector. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/pify?keyword=household+expenditure+form+template+uk
    • http://files.brigetteburns.com/uploads/1/3/1/3/131380292/norimitufilovigu.pdf
    • http://files.jenwahintuition.com/uploads/1/3/1/3/131381006/41a12ca2bfad29.pdf
    • http://files.nativetales.com/uploads/1/3/0/7/130775942/b90bae542e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0459/7389/7383/files/intellij_generate_code_coverage_report.pdf
    • https://cdn.shopify.com/s/files/1/0432/6955/4332/files/zomamaxesaxon.pdf
    • https://cdn.shopify.com/s/files/1/0429/7061/1861/files/assistant_administratif_et_financier.pdf
    • https://cdn.shopify.com/s/files/1/0433/0133/9304/files/affectation_du_rsultat_ohada.pdf
    • https://cdn.shopify.com/s/files/1/0460/1747/8815/files/certiport_for_mac.pdf
    • https://cdn.shopify.com/s/files/1/0428/0903/2863/files/image_binary_data_android.pdf
    • https://cdn.shopify.com/s/files/1/0440/2947/7014/files/android_bitmap_resize_aspect_ratio.pdf
    • https://cdn.shopify.com/s/files/1/0459/9808/0157/files/4747151844.pdf
    • https://cdn.shopify.com/s/files/1/0452/6351/9906/files/wnyc_weekly_schedule.pdf
    • https://cdn.shopify.com/s/files/1/0433/1870/6341/files/begefepekamekubanuto.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_off0000496d.bin
713694053c594745465bdc1ebba57df8f7e9fc7eda01c793dd44fad59f55f330		 pdf-font-stream PDF embedded font (sfnt) at offset 0x496D 5372 bytes
font_01_sfnt_off00005b86.bin
347e5c1b8c0c13a1c2bd183d5a2e5d82589ac70dd1ceb42ff084003f31d1cd1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B86 9180 bytes

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