Malicious PDF — malware analysis report

Static analysis result for SHA-256 8883b9d558705377…

MALICIOUS

PDF

113.1 KB Created: 2020-08-04 09:20:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4581b29622045acf98597e2d94e492c SHA-1: e00e73f0e10b77467cd79a7976137db81c956541 SHA-256: 8883b9d55870537727a58be736882af1b328a8a53851032bc4040745a76b3999
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, appears to contain the URL and a title related to an 'emotional quotient inventory'. The presence of a link farm heuristic suggests an attempt to manipulate search engine results or distribute malicious content through numerous external links. The ML classifier strongly indicates malicious intent.

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=baron+emotional+quotient+inventory+pdf
    • http://files.newencores.com/uploads/1/3/0/8/130814666/lasufejikidij_rewofa_wowamixo_dimomifomope.pdf
    • http://files.sfalumnimajorette.com/uploads/1/3/0/7/130776589/vamewobe.pdf
    • http://files.kincardinecheetahs.ca/uploads/1/3/2/6/132681342/bb6b9b1f6e3a498.pdf
    • http://files.makemeupga.com/uploads/1/3/2/7/132740637/5315506.pdf
    • https://cdn.shopify.com/s/files/1/0432/3803/1518/files/57146087808.pdf
    • https://cdn.shopify.com/s/files/1/0433/7506/7297/files/8477311716.pdf
    • https://cdn.shopify.com/s/files/1/0431/5018/0512/files/78483694164.pdf
    • https://cdn.shopify.com/s/files/1/0434/7153/6285/files/58038543248.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/gijuvapumexasim.pdf
    • https://cdn.shopify.com/s/files/1/0432/2322/0392/files/catia_tutorial_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0434/1065/3338/files/65465713000.pdf
    • https://cdn.shopify.com/s/files/1/0434/7225/7181/files/webm_to_gifs.pdf
    • https://cdn.shopify.com/s/files/1/0428/8544/7833/files/3142220352.pdf
    • https://cdn.shopify.com/s/files/1/0429/8365/3535/files/69071025690.pdf
    • https://cdn.shopify.com/s/files/1/0437/3217/2951/files/artificial_intelligence_and_expert_system_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0429/7116/8931/files/19859003150.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_off00017228.bin
047f94d10117ac25e8df291352fedbe6612c39a8d55a4d3c8fe7f0a89a9c081b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17228 5228 bytes
font_01_sfnt_off000183e0.bin
560d009bab329ee23b54dd0d2846c788efac04f00f1c35bd5b6540391669d8a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x183E0 11012 bytes
font_02_sfnt_off0001a8a4.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A8A4 4324 bytes

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