Malicious PDF — malware analysis report

Static analysis result for SHA-256 13fb2225ea3df8e2…

MALICIOUS

PDF

57.4 KB Created: 2020-08-08 09:07:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e89f09749b21ec9380caa08c666b8258 SHA-1: dd81ba878756b665e927bf71a789b5c894456508 SHA-256: 13fb2225ea3df8e2dc25c389b09308add69e5405a24cf8be803725225549d432
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ttraff.cc/pify?keyword=anisocoria+trauma+pdf'. The document also exhibits characteristics of a link farm, with numerous external PDF links, suggesting a tactic to distribute malicious content or engage in SEO manipulation. The ML classifier strongly supports the malicious nature of this PDF.

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=anisocoria+trauma+pdf
    • http://firudi.atvdeserthome.com/uploads/1/3/1/8/131871699/buwubovenipima_bumanowet.pdf
    • http://files.nwcoasttrader.com/uploads/1/3/1/4/131454151/taxeb-boxekidojotud-mozavowi-wegemaxemobo.pdf
    • http://files.mrfromm.com/uploads/1/3/0/7/130738792/winotabaxukotalilab.pdf
    • http://files.mayadabellydance.com/uploads/1/3/1/4/131437599/fafexi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0438/9801/1816/files/74590505547.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/peboginesewuxexadamo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9076/3175/files/regub.pdf
    • https://cdn.shopify.com/s/files/1/0432/1515/9458/files/above_and_below_board_game_rules.pdf
    • https://cdn.shopify.com/s/files/1/0431/1249/7303/files/liberalismo_politico_john_rawls.pdf
    • https://cdn.shopify.com/s/files/1/0434/4997/4946/files/royksopp_remind_me.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78476378890.pdf
    • https://cdn.shopify.com/s/files/1/0433/4606/7621/files/zodinutumivaladi.pdf
    • https://cdn.shopify.com/s/files/1/0434/1481/4885/files/security_risk_assessment_report.pdf
    • https://cdn.shopify.com/s/files/1/0432/5657/8212/files/rerosegefonurufutu.pdf
    • https://cdn.shopify.com/s/files/1/0452/1459/7271/files/mht_cet_2020_result.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_off00009688.bin
33ac15fa1881f90663108345a91676aca5adf7d9636acf356b6ce3d52e88a910		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9688 5024 bytes
font_01_sfnt_off0000a773.bin
a8f07d049264d04889caa398e8342b3ccb1e2262810cb7c9e1e0f96571e5b521		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA773 10432 bytes
font_02_sfnt_off0000caca.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCACA 4324 bytes

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