Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b6dc88ce1ae3776…

MALICIOUS

PDF

35.4 KB Created: 2020-08-06 11:54:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f144134c745912f9bd03f77438cbe542 SHA-1: 4cc8fce4f91a7eae86f0a63e45e061cd5b39560d SHA-256: 6b6dc88ce1ae3776fb7f129431d012865a9a5cc4d569c24d5d95d183dfe9b4b5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to benign Shopify URLs, but one critical link directs to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the same malicious URL and a keyword suggesting a lure for a 'medical certificate form'. This indicates a likely phishing or malware distribution attempt.

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=medical+certificate+form+pdf+kerala
    • http://files.marykmurphyart.com/uploads/1/3/0/7/130739294/kidabiteso.pdf
    • http://files.lynnkirkham.net/uploads/1/3/0/8/130874318/6548217.pdf
    • http://files.mi6app.com/uploads/1/3/0/9/130969169/zakusik_gimevikokibo.pdf
    • http://files.robertbsheeks.com/uploads/1/3/1/8/131871419/c635473d081.pdf
    • http://files.sylvanbeachfestival.com/uploads/1/3/1/1/131163559/3706158.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37357510366.pdf
    • https://cdn.shopify.com/s/files/1/0440/0611/3430/files/95302529640.pdf
    • https://cdn.shopify.com/s/files/1/0427/8861/8396/files/bimonthly_vs_semimonthly.pdf
    • https://cdn.shopify.com/s/files/1/0430/6305/0394/files/alginate_structure.pdf
    • https://cdn.shopify.com/s/files/1/0429/5832/3865/files/61941203029.pdf
    • https://cdn.shopify.com/s/files/1/0431/4375/7985/files/answer_sheet_shading.pdf
    • https://cdn.shopify.com/s/files/1/0432/3989/9304/files/42943925971.pdf
    • https://cdn.shopify.com/s/files/1/0431/6990/6854/files/ralariwamujela.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/22650439267.pdf
    • https://cdn.shopify.com/s/files/1/0434/3683/4968/files/vofabikixitogugimu.pdf
    • https://cdn.shopify.com/s/files/1/0430/0891/7657/files/97423217482.pdf
    • https://cdn.shopify.com/s/files/1/0433/7188/8803/files/xijitepasupatu.pdf
    • https://cdn.shopify.com/s/files/1/0429/4151/3894/files/52501206905.pdf
    • https://cdn.shopify.com/s/files/1/0433/2604/6362/files/calendario_agosto_2020_imprimir.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_off00004d99.bin
845c6105e544c1e30b689149c5a8897e67c927d8cb94a28642a8009172b1deaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D99 5192 bytes
font_01_sfnt_off00005f3c.bin
19c63b7ba998241bac6551b93786b9822d34987b5d5fb16a605ec394b25dda1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F3C 9768 bytes

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