Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf6ac6b4e3be3744…

MALICIOUS

PDF

42.4 KB Created: 2020-08-12 08:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8080358ad36ad61530363801dc8e327 SHA-1: 0b077bbbf13aca34f278fcee918f73726d9dac76 SHA-256: bf6ac6b4e3be3744c91805334d6c7e4da50239327cbf759bbae75a2d9d982304
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The primary malicious URL identified is 'https://ttraff.com/pify?keyword=thinking+in+java+pdf', which likely serves as a gateway to further malicious content. The document also exhibits characteristics of an SEO link farm, with many links pointing to external PDFs hosted on various domains, including multiple Shopify subdomains and custom domains. This suggests an attempt to manipulate search engine results or distribute malicious payloads through a network of linked documents.

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.com/pify?keyword=thinking+in+java+pdf
    • http://files.bakesterhistory.com/uploads/1/3/1/1/131164097/7574745.pdf
    • http://files.strikesforkidsseattle.com/uploads/1/3/0/7/130776674/5d65f4976.pdf
    • http://files.shcscience.com/uploads/1/3/0/8/130873732/xerasizofeg.pdf
    • http://files.highdemandhair.com/uploads/1/3/1/3/131380845/merabipetuxopobogera.pdf
    • http://files.insightenergy.ca/uploads/1/3/0/9/130969364/2702780.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23342697578.pdf
    • https://cdn.shopify.com/s/files/1/0431/1692/0994/files/54307000988.pdf
    • https://cdn.shopify.com/s/files/1/0432/2017/2957/files/97897734371.pdf
    • https://cdn.shopify.com/s/files/1/0427/7311/9143/files/lerevosusawu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4511/7342/files/17633152161.pdf
    • https://cdn.shopify.com/s/files/1/0436/0024/8995/files/caballero_de_oriente_y_occidente.pdf
    • https://cdn.shopify.com/s/files/1/0436/0696/6429/files/15345699998.pdf
    • https://cdn.shopify.com/s/files/1/0437/7346/0641/files/vanabemubewazexivi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nudukesobiji.pdf
    • https://cdn.shopify.com/s/files/1/0429/9826/8065/files/exogenous_depression.pdf
    • https://cdn.shopify.com/s/files/1/0441/4128/1432/files/c_copy_constructor.pdf
    • https://cdn.shopify.com/s/files/1/0427/3196/2535/files/arretez_moi_lisa_gardner_gratuit.pdf
    • https://cdn.shopify.com/s/files/1/0430/4021/1097/files/tijenapedo.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_off00006773.bin
10f6c9c4d3ac2ea23e0137fe51a2397166680e243e547d568d17c495ea3e8edc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6773 5144 bytes
font_01_sfnt_off00007903.bin
771ed7fa462b1c878cd2be03757ddfec6ce7a3c19bf36dac98e8c94c0a39adee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7903 10588 bytes

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