Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcf633356a5b02ad…

MALICIOUS

PDF

44.2 KB Created: 2020-08-09 20:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e73b7b4e0ddd4221f92700e629f9737e SHA-1: cfafe3b8751008751b765d42dbedb88d224cd6cf SHA-256: dcf633356a5b02ad06c9b0bfde5c22ef81924cf873b1e7748196349bd64ae6f4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass external link farm, with a primary link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=functional+groups+biochemistry+pdf', which is flagged as a malicious redirector. The presence of numerous links hosted on Shopify and other file-sharing services suggests an attempt to distribute malicious content broadly. No scripts were extracted from this sample.

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=functional+groups+biochemistry+pdf
    • http://files.bobapink.com/uploads/1/3/1/4/131437669/sedosepe_ropoxobusu_rusuwaburuz_zebuwozajepoza.pdf
    • http://files.hawknews.org/uploads/1/3/1/1/131164488/9474988.pdf
    • http://files.plasticactionuk.co.uk/uploads/1/3/1/4/131453620/deb69b5b6ad4194.pdf
    • http://files.theworkplacehealthcoach.com/uploads/1/3/1/4/131453177/434057.pdf
    • http://files.district12volleyball.com/uploads/1/3/1/4/131407088/kesezofoseke-vijomokirutina.pdf
    • https://cdn.shopify.com/s/files/1/0430/3234/6773/files/76570445782.pdf
    • https://cdn.shopify.com/s/files/1/0432/6568/7717/files/musekojor.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/surorut.pdf
    • https://cdn.shopify.com/s/files/1/0454/5295/1704/files/mathematics_functions_grade_12.pdf
    • https://cdn.shopify.com/s/files/1/0432/6300/0734/files/4854767574.pdf
    • https://cdn.shopify.com/s/files/1/0436/5965/7374/files/famamimatakuxidur.pdf
    • https://cdn.shopify.com/s/files/1/0429/6943/2230/files/84694553161.pdf
    • https://cdn.shopify.com/s/files/1/0428/3459/1907/files/ssat_middle_level_practice_test.pdf
    • https://cdn.shopify.com/s/files/1/0438/5370/9472/files/anacardiaceae_family.pdf
    • https://cdn.shopify.com/s/files/1/0427/4146/5244/files/wamuwagexesejukupaguvab.pdf
    • https://cdn.shopify.com/s/files/1/0428/2603/9463/files/napazexojibomabojuvova.pdf
    • https://cdn.shopify.com/s/files/1/0436/4979/4213/files/2018_subaru_crosstrek_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/3291/9720/files/55586201377.pdf
    • https://cdn.shopify.com/s/files/1/0434/2310/5189/files/16988255139.pdf
    • https://cdn.shopify.com/s/files/1/0434/0154/3831/files/goper.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006de0.bin
9567f4b0decf3ca03f8d15396f653845cfc0d7af2041044e759a9cc0a856c10c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DE0 5764 bytes
font_01_sfnt_off00008154.bin
7dd56a73f976a7555acabea8bc9fa598f858fb8a78681d4c9fa19e655a6d569d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8154 9876 bytes

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