Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f4a502a6b1b2d30…

MALICIOUS

PDF

63.0 KB Created: 2020-08-18 23:25:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f42c42a0fea6b74361c7cdf49c95aa8a SHA-1: 3b851f54ec4a0774379deeae0482124f0c37835e SHA-256: 0f4a502a6b1b2d30a7ec3aab56fb1eda81e0c5325b2384ed29bbe9079c4df80a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous embedded links, masquerading as a "brave new world book parents guide", with the primary link directing to a known malicious redirector. This suggests a link farm or SEO poisoning tactic to drive traffic to malicious infrastructure. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or redirection attack.

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=brave+new+world+book+parents+guide
    • http://files.fiercetanning.com/uploads/1/3/1/1/131164372/pokafidikede.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/0546/7035/files/88205637219.pdf
    • https://cdn.shopify.com/s/files/1/0428/8479/2479/files/dofolama.pdf
    • https://cdn.shopify.com/s/files/1/0434/5308/7911/files/descargar_libros_de_paulo_coelho_adulterio.pdf
    • https://cdn.shopify.com/s/files/1/0430/9775/1709/files/sample_biodata_form_philippines.pdf
    • https://cdn.shopify.com/s/files/1/0439/1125/0075/files/diferencias_entre_respiracion_aerobia_y_anaerobia.pdf
    • https://cdn.shopify.com/s/files/1/0433/6871/0309/files/pizza_hut_learning_zone.pdf
    • https://cdn.shopify.com/s/files/1/0430/9496/6436/files/65834330463.pdf
    • https://cdn.shopify.com/s/files/1/0429/3564/8409/files/28530169348.pdf
    • https://cdn.shopify.com/s/files/1/0451/1806/2746/files/dobedelekorip.pdf
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/nick_cave_breathless_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0432/2358/0830/files/epidemiologia_y_estadistica_basica.pdf
    • https://cdn.shopify.com/s/files/1/0434/4558/4033/files/dd_form_2813.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a35d.bin
dbf6c650158b2132a71bdaa57c650db831c05758868132b2dd3a4e2583d031e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA35D 5532 bytes
font_01_sfnt_off0000b64d.bin
4075bfa86c34c2f415d3601ba0472518c825f8b2d0ff5a665f1c5cfc07ec74d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB64D 10368 bytes
font_02_sfnt_off0000d9ee.bin
9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EE 16092 bytes

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