Malicious PDF — malware analysis report

Static analysis result for SHA-256 24b1101deebc920e…

MALICIOUS

PDF

44.5 KB Created: 2020-08-14 15:31:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ac56e7a05ca627845a70a64ab08c796 SHA-1: fe038134aa8babbe60f3af0a4c933d07b9671929 SHA-256: 24b1101deebc920ea119ced40a9f9d1dae74393bc4166234a015450749199e9e
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one identified as a malicious redirector. The heuristic PDF_SEO_LINK_FARM indicates a mass external PDF link farm, suggesting a SEO poisoning or link farm attack. The ML classifier strongly flagged this PDF as malicious. The primary malicious IOC is the redirector URL, which likely leads to further malicious content or phishing pages.

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=curso+operador+de+calderas+industriales+pdf
    • http://files.authorshirts.com/uploads/1/3/1/3/131378852/gasumepotuju.pdf
    • https://cdn.shopify.com/s/files/1/0432/9734/1604/files/80792182985.pdf
    • https://cdn.shopify.com/s/files/1/0437/3020/6885/files/fozamagofakupaja.pdf
    • https://cdn.shopify.com/s/files/1/0435/6099/2927/files/40488827588.pdf
    • https://cdn.shopify.com/s/files/1/0435/3504/0664/files/42084606245.pdf
    • https://cdn.shopify.com/s/files/1/0436/0349/3022/files/77910259220.pdf
    • https://cdn.shopify.com/s/files/1/0432/0778/6651/files/fikuxutamafof.pdf
    • https://cdn.shopify.com/s/files/1/0429/0982/7231/files/9794443233.pdf
    • https://cdn.shopify.com/s/files/1/0432/9547/3822/files/bovelavi.pdf
    • https://cdn.shopify.com/s/files/1/0430/5757/8137/files/49964418464.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_off00005fd0.bin
49b87531b1970e49fb877f5ca06832ad42cc017287d4b2b82b6ff9f41eb0f14b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FD0 5052 bytes
font_01_sfnt_off0000710e.bin
6620aac9aeef64fb3f6803ca1a4f12dc4c090faaecf354177e8626e7b35e7e49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x710E 11380 bytes
font_02_sfnt_off00009554.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9554 4324 bytes

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