Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e24bf81457b770c…

MALICIOUS

PDF

45.8 KB Created: 2020-08-03 14:26:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed81d84535b8207bdebcdf457084300c SHA-1: c6b0fa6e6fdf3532393ae58637ff14f829d3de9f SHA-256: 5e24bf81457b770c7c3b213c06f3c4e208f16edcd69ab697801b3274be1b80e3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded links, with one heuristic specifically identifying it as a PDF link farm. The primary malicious URL, 'https://ttraff.ru/pify?keyword=estudio+descriptivo+caracteristicas+pdf', is flagged as a known malicious redirector. This suggests the document is likely used for SEO spam or to redirect users to malicious sites, potentially for phishing or malware distribution.

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=estudio+descriptivo+caracteristicas+pdf
    • http://files.kennedysarff.com/uploads/1/3/0/8/130814935/keberoduxezepa-vewexunegubuv-kepozazuvofu.pdf
    • http://files.bradleyhartmanbakken.com/uploads/1/3/0/9/130969399/jutadofetesajavazoj.pdf
    • http://files.mindfulnessnow.co.uk/uploads/1/3/0/7/130775498/podirefibom.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/7218/3703/files/vikafekide.pdf
    • https://cdn.shopify.com/s/files/1/0428/8220/3801/files/8237324729.pdf
    • https://cdn.shopify.com/s/files/1/0437/7722/8957/files/modoxesizavep.pdf
    • https://cdn.shopify.com/s/files/1/0431/0587/8170/files/93707082614.pdf
    • https://cdn.shopify.com/s/files/1/0437/8486/3893/files/12622635336.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nudukesobiji.pdf
    • https://cdn.shopify.com/s/files/1/0437/9394/0629/files/99813169629.pdf
    • https://cdn.shopify.com/s/files/1/0432/0909/7376/files/macro_commands_ffxiv.pdf
    • https://cdn.shopify.com/s/files/1/0430/7596/0985/files/38024646441.pdf
    • https://cdn.shopify.com/s/files/1/0433/1700/2405/files/skyrim_vs_skyrim_special_edition_mods.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7416/files/84591029773.pdf
    • https://cdn.shopify.com/s/files/1/0431/0269/9681/files/67996360449.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sosivizugepu.pdf
    • https://cdn.shopify.com/s/files/1/0428/0510/0707/files/rononazevuduladez.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_off0000728c.bin
40952de4323da3efd48f6b968101b3c5697bc1815f481e2f58b466b51d1e4798		 pdf-font-stream PDF embedded font (sfnt) at offset 0x728C 5136 bytes
font_01_sfnt_off00008423.bin
e4e6c3fc3770d6c1e5c671ed46c9e2e4788104c4c65e1da5c5195afa71f3d6b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8423 11040 bytes

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