Malicious PDF — malware analysis report

Static analysis result for SHA-256 84d79e2ec100e428…

MALICIOUS

PDF

43.7 KB Created: 2020-08-16 20:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8fa5b58643b6908e0efd952345780226 SHA-1: ab104895351e654354771a81f8b8257406d19352 SHA-256: 84d79e2ec100e428d2d86db2345294d924378e2ce93926459da8337e4d375278
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying it as a redirector link to a known malicious domain. The document body, though partially corrupted, contains text related to 'latest android version names' and includes the malicious URL, suggesting a lure to a phishing or malware distribution site. The presence of multiple Shopify links, while marked as benign, are likely part of a link farm to obscure the malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=latest+android+version+names
    • http://files.notiersfrontiers.com/uploads/1/3/2/6/132696598/vuxiv_lupomi_ripanotagux_wiwagojekek.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/8987/7405/files/33226696837.pdf
    • https://cdn.shopify.com/s/files/1/0440/7217/3733/files/24951528845.pdf
    • https://cdn.shopify.com/s/files/1/0431/3071/6322/files/joxikanoxala.pdf
    • https://cdn.shopify.com/s/files/1/0432/3108/4708/files/administracion_de_recursos_humanos_novena_edicion.pdf
    • https://cdn.shopify.com/s/files/1/0438/9208/0792/files/kujodom.pdf
    • https://cdn.shopify.com/s/files/1/0429/9587/6003/files/91700761929.pdf
    • https://cdn.shopify.com/s/files/1/0432/1722/3840/files/taxajalemelid.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_off00006f3f.bin
46c77b475e38871b5e060afb83a7ef7c4e6e1024c6b44ea667ac986781e1a184		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F3F 4940 bytes
font_01_sfnt_off00007ff9.bin
5cf65075b64f54327d50fbb576deb923f37e09e27e9bbd5bf2967df9d13a7f96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FF9 10224 bytes

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