Malicious PDF — malware analysis report

Static analysis result for SHA-256 70fba1f25d055977…

MALICIOUS

PDF

35.1 KB Created: 2020-08-25 21:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c2215cadf4324ae59e14e3f0ed460447 SHA-1: 349445ddc2e913e28f33bd0a6a129fe0699ffb0b SHA-256: 70fba1f25d055977a1884d0f583e3e09ebe07affb834d026ea6faa9cf25ff22d
162 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link and a large number of external PDF links, suggesting a link farm or SEO poisoning tactic. The 'SE_DOWNLOAD_BUTTON' heuristic indicates a lure to click a link, which points to the malicious URL. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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.ru/pify?keyword=restaurant+success+by+the+numbers+pd
    • http://tamire.myhillchurch.com/uploads/1/3/2/7/132740763/vopewo-rebal-betuzolov.pdf
    • http://files.kelleycarney.com/uploads/1/3/2/8/132814024/1911118.pdf
    • http://files.brycecon.com/uploads/1/3/0/7/130776646/kebivagukomeku.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/9309/6600/files/nupadusebizafo.pdf
    • https://cdn.shopify.com/s/files/1/0429/9200/9365/files/adobe_premiere_pro_cc_2020_help.pdf
    • https://cdn.shopify.com/s/files/1/0432/3265/7568/files/bleacher_report_college_football_preseason_rankings.pdf
    • https://cdn.shopify.com/s/files/1/0432/0870/4164/files/cuddle_buddy_application_form_blank.pdf
    • https://cdn.shopify.com/s/files/1/0438/7209/2315/files/xuxekidujakavakogomi.pdf
    • https://cdn.shopify.com/s/files/1/0428/5025/5014/files/vim_set_ai.pdf
    • https://cdn.shopify.com/s/files/1/0427/9628/6111/files/dosozuvan.pdf
    • https://cdn.shopify.com/s/files/1/0431/1462/7223/files/leviathan_raid_guide_datto.pdf
    • https://cdn.shopify.com/s/files/1/0431/8861/7378/files/xegukumoxajesaxuvan.pdf
    • https://cdn.shopify.com/s/files/1/0431/8127/7342/files/lerekikogavizefut.pdf
    • https://cdn.shopify.com/s/files/1/0432/8977/2187/files/41440712279.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_off00004bf4.bin
63151ba2d51e5b32069db35285a44e7c45903bc591b5b3019b354829b2a28fcb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4BF4 5532 bytes
font_01_sfnt_off00005e91.bin
4d55e23535e745c82fc0c598bca397584ee9e09e8343e7eb65dd8d52d7e26fa1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E91 9756 bytes

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