Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c4274bfdf69b810…

MALICIOUS

PDF

41.5 KB Created: 2020-08-11 23:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6663ba8802354117ff9aa901cb015a3d SHA-1: 6a0f03f0f4152e60601dcdf84f34fbcad71aba52 SHA-256: 5c4274bfdf69b810e14f6880813b01ccf4e50e0ace75ca9ee56c377697ff8daa
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to external PDF files, suggesting a link farm designed for SEO manipulation. One prominent link, 'https://ttraff.ru/pify?keyword=carrie+a+estranha+livro+pdf', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. This indicates the document's primary purpose is to redirect users to potentially harmful content.

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=carrie+a+estranha+livro+pdf
    • http://files.jimsvintagemags.com/uploads/1/3/1/6/131636642/219047fa4f3e.pdf
    • http://files.ingridbego.com/uploads/1/3/1/6/131636889/nijixu_doliwures_jeduvaniri_mokonin.pdf
    • http://jefifeliv.raypecbasketball.com/uploads/1/3/0/8/130874493/mekuraxolor_duves.pdf
    • http://files.lux4light.com/uploads/1/3/1/3/131381540/mevofadikaxufuj_tufeledez_rugizasozu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0702/5056/files/lonovix.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72518400380.pdf
    • https://cdn.shopify.com/s/files/1/0439/0794/0520/files/58567758395.pdf
    • https://cdn.shopify.com/s/files/1/0430/0632/8995/files/63734311900.pdf
    • https://cdn.shopify.com/s/files/1/0431/2956/9429/files/69368887820.pdf
    • https://cdn.shopify.com/s/files/1/0443/3071/3244/files/antipsychotic_medications_list.pdf
    • https://cdn.shopify.com/s/files/1/0431/0541/9418/files/22429714814.pdf
    • https://cdn.shopify.com/s/files/1/0447/1295/1961/files/pokemon_silver_online.pdf
    • https://cdn.shopify.com/s/files/1/0437/5429/1354/files/anatomia_bochenka.pdf
    • https://cdn.shopify.com/s/files/1/0427/6997/3415/files/47237207185.pdf
    • https://cdn.shopify.com/s/files/1/0437/3191/0821/files/zagudurivamaduvoduk.pdf
    • https://cdn.shopify.com/s/files/1/0437/1775/5034/files/bitcoin_que_es.pdf
    • https://cdn.shopify.com/s/files/1/0433/8388/1893/files/15798016583.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_off0000642a.bin
02fc4aed3e9916f6d6aef07f3416e61b72c6d3ff0e43dbd75f90d65152d50016		 pdf-font-stream PDF embedded font (sfnt) at offset 0x642A 5096 bytes
font_01_sfnt_off00007579.bin
675228555c4f6fe163e5fdcc89541832701714982c68c57eb6407aa2efe2a8cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7579 10540 bytes

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