Malicious PDF — malware analysis report

Static analysis result for SHA-256 8249f1925c022412…

MALICIOUS

PDF

70.4 KB Created: 2020-08-19 06:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99619b66e6ad2f83212f2f7782b01d8b SHA-1: c546c4ac5600a1c726cd1e957d5f4a3b96ebaf90 SHA-256: 8249f1925c02241227818f98eb7810701504eecbdae59644f75b899b154502f5
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with a critical heuristic identifying it as a link farm pointing to a malicious redirector. The primary malicious URL observed is https://ttraff.ru/pify?keyword=bhakti+songs+free++telugu, which is likely used to obscure the true destination of the malicious content. The ML classifier also strongly indicated maliciousness.

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=bhakti+songs+free++telugu
    • http://vepuz.brentwoodpetresort.net/uploads/1/3/1/3/131398473/a8d3215dc.pdf
    • http://files.customtshirts-more.com/uploads/1/3/0/8/130873840/4624871.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/1095/6196/files/24520947085.pdf
    • https://cdn.shopify.com/s/files/1/0435/9212/2536/files/al_mulk_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/8600/2838/files/nezuwokilatiwil.pdf
    • https://cdn.shopify.com/s/files/1/0433/0212/5733/files/92750999446.pdf
    • https://cdn.shopify.com/s/files/1/0434/7500/9698/files/90728762083.pdf
    • https://cdn.shopify.com/s/files/1/0434/3939/0872/files/buell_xb9_performance_parts.pdf
    • https://cdn.shopify.com/s/files/1/0432/0329/7438/files/46460437190.pdf
    • https://cdn.shopify.com/s/files/1/0437/5838/7349/files/falapejuf.pdf
    • https://cdn.shopify.com/s/files/1/0440/3462/1590/files/nekurirebefagazu.pdf
    • https://cdn.shopify.com/s/files/1/0437/6789/0069/files/the_alphabet_song_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0435/2439/1071/files/internal_audit_report.pdf
    • https://cdn.shopify.com/s/files/1/0437/9266/2688/files/dozadepom.pdf
    • https://cdn.shopify.com/s/files/1/0435/9254/8515/files/jedi_knight_2_cheats.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_off0000c383.bin
73f609e46fda803bea3fbf5c3297ff407efa4ed5a835e1404e8ca6f6c5b36688		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC383 5024 bytes
font_01_sfnt_off0000d489.bin
c0bd2dc5dc3ce30b18f155a50545d3de921d2df4b96a55aa9dae5d0d42f46605		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD489 13584 bytes
font_02_sfnt_off0000fede.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDE 4324 bytes

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