Malicious PDF — malware analysis report

Static analysis result for SHA-256 19ec7f0907f9427c…

MALICIOUS

PDF

44.3 KB Created: 2020-08-04 21:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d24ec7237005c77fb3db95e14e749f47 SHA-1: bb68e131c8623aae6abaeb5dbfafce8468f5930c SHA-256: 19ec7f0907f9427cf916696f0f7cfd99923da9e9464e69e7d47446a3ae5ac6e9
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many of which point to external PDF files hosted on various domains, including a known malicious redirector. The document body, though heavily obfuscated, contains a reference to 'Berserk volume 22 pdf' and a URL that redirects to a malicious site, indicating a lure to download potentially harmful content. The ML classifier strongly supports the malicious verdict.

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=berserk+volume+22+pdf
    • http://files.hpccdenver.org/uploads/1/3/1/4/131438423/2598777.pdf
    • http://katekuwa.elchristian.net/uploads/1/3/0/7/130775934/6042464.pdf
    • http://files.vogelsangartwork.com/uploads/1/3/1/6/131636956/ce44b52a2694be.pdf
    • http://files.pirhozeta1920.com/uploads/1/3/1/3/131398385/tilosawa-dugutam-mogiwowipo-mekatogeduj.pdf
    • https://cdn.shopify.com/s/files/1/0429/3463/2607/files/nujaranavavugogiwujexuxow.pdf
    • https://cdn.shopify.com/s/files/1/0438/5095/6960/files/how_to_find_sd_card_on_mac.pdf
    • https://cdn.shopify.com/s/files/1/0433/0212/5733/files/45008826871.pdf
    • https://cdn.shopify.com/s/files/1/0432/3291/9720/files/92868303713.pdf
    • https://cdn.shopify.com/s/files/1/0450/4154/9462/files/direct_selling_strategy.pdf
    • https://cdn.shopify.com/s/files/1/0438/5056/3734/files/nebuk.pdf
    • https://cdn.shopify.com/s/files/1/0435/9746/3714/files/jegodasunamoxorixaguda.pdf
    • https://cdn.shopify.com/s/files/1/0432/6067/4198/files/vobivulanar.pdf
    • https://cdn.shopify.com/s/files/1/0429/7778/8057/files/tolobexinuzapa.pdf
    • https://cdn.shopify.com/s/files/1/0431/8766/7104/files/luzupasiwijemuzupeku.pdf
    • https://cdn.shopify.com/s/files/1/0431/4228/3432/files/migixiwozas.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_off00006287.bin
567785245ac8c48a8081ab0d3c573f4cfe183f6d5ea248ef48a10856f2931e5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6287 3616 bytes
font_01_sfnt_off00006f68.bin
e714086c83786ff7ac1534fc170f460e26c4b93f8eba81bbde91dca983208c8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F68 5284 bytes
font_02_sfnt_off0000815e.bin
300788fd8ed0b16ad3d99c6447fd0c1f9f22f5b1054f5eb945fb06389e0b4dd7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x815E 10220 bytes

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