Malicious PDF — malware analysis report

Static analysis result for SHA-256 416bca040587a02d…

MALICIOUS

PDF

67.9 KB Created: 2020-08-07 22:54:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce0367ec4924d33940ced3ca76784369 SHA-1: 399e7105ca4ff3ee0dc1630ac534f927587c2f5e SHA-256: 416bca040587a02d58f28f4e4b20f4273516d4cbade65c7a7a55f89d9f86b07c
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 PowerShell

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=discrete+probability+distribution+pdf'. Another critical heuristic indicates a PDF link farm, with many links pointing to Shopify domains, suggesting an attempt to distribute malicious content or SEO manipulation. The ML classifier strongly flagged this PDF as malicious.

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.cc/pify?keyword=discrete+probability+distribution+pdf
    • http://files.viewsfromthejumpseat.net/uploads/1/3/2/6/132695575/najimejo-rivizotipikoka-fitev-venafafodugibid.pdf
    • http://files.mrwillpe.com/uploads/1/3/1/4/131483361/kadosiwowuvixe_wutenizinojupa_fatesupijiji.pdf
    • http://files.goodatlooking.com/uploads/1/3/0/9/130969200/7445030.pdf
    • http://files.alanbirtwistle.com/uploads/1/3/1/3/131383664/werox_xapedewero_bemidituziv_zurer.pdf
    • http://posafimo.darnisart.com/uploads/1/3/1/4/131408738/6130462.pdf
    • https://cdn.shopify.com/s/files/1/0429/3446/8774/files/nivem.pdf
    • https://cdn.shopify.com/s/files/1/0428/7044/0095/files/57950274315.pdf
    • https://cdn.shopify.com/s/files/1/0435/7246/1727/files/89597014138.pdf
    • https://cdn.shopify.com/s/files/1/0431/5647/1959/files/gevefadetumemaxuzuwipol.pdf
    • https://cdn.shopify.com/s/files/1/0434/8638/0197/files/surah_al_mulk_full_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/6808/7701/files/20175198840.pdf
    • https://cdn.shopify.com/s/files/1/0428/8951/1068/files/finale_export.pdf
    • https://cdn.shopify.com/s/files/1/0437/8161/9861/files/monthly_calendar_2020_printable.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/8402105605.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wefudebavisizaku.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ab49.bin
e7632e1324a279d46a6ad17878ddd0f5c0dea148eb693f20d725b9ca308ccc99		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB49 5392 bytes
font_01_sfnt_off0000bdb6.bin
7a31a85134b5584f6e826024b662b55c6c5944887ffd94560657dee38666ff10		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB6 14228 bytes
font_02_sfnt_off0000eb6a.bin
a6d22f72f7ec6c4f8acbb17f39beea26fb87b184be7f97f25fe001e39180d6d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6A 16524 bytes

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