Malicious PDF — malware analysis report

Static analysis result for SHA-256 9387dab3d2061f40…

MALICIOUS

PDF

34.0 KB Created: 2020-08-18 23:39:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df1bb0daf783ecd158cd7220abf290e4 SHA-1: 682016ff951ffd4b07f9ddeb84d6e97cae149030 SHA-256: 9387dab3d2061f40d08be4145b45ee0195ccf25f1fa9328d0427f36ac912335f
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting an attempt to manipulate search engine results or distribute malicious content through a link farm. The primary malicious URL identified is https://ttraff.com/pify?keyword=naming+alkenes+alkynes+worksheet+with+answers, which likely serves as a gateway to further malicious activity.

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=naming+alkenes+alkynes+worksheet+with+answers
    • http://files.ludh-golf.co.uk/uploads/1/3/1/4/131454505/4523836.pdf
    • http://zuxudef.rebec2000.com/uploads/1/3/1/4/131453247/tovaxosu.pdf
    • http://sazujum.juliehui.co/uploads/1/3/2/3/132302780/2914e481134cd0c.pdf
    • http://files.movingcompanyokc.com/uploads/1/3/0/8/130814706/jupugokafi.pdf
    • https://cdn.shopify.com/s/files/1/0432/4674/7803/files/61027197520.pdf
    • https://cdn.shopify.com/s/files/1/0437/4590/2746/files/displacer_type_level_transmitter_datasheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/0645/9029/files/rurinowilikiwof.pdf
    • https://cdn.shopify.com/s/files/1/0432/4101/3412/files/67395610144.pdf
    • https://cdn.shopify.com/s/files/1/0438/2100/7005/files/appendicular_and_axial_skeleton.pdf
    • https://cdn.shopify.com/s/files/1/0432/9691/5621/files/foworutuxuzimo.pdf
    • https://cdn.shopify.com/s/files/1/0433/6710/4668/files/56148564928.pdf
    • https://cdn.shopify.com/s/files/1/0427/4687/1974/files/tatedivogoxaropi.pdf
    • https://cdn.shopify.com/s/files/1/0448/2993/3725/files/supreme_court_enlargement_of_criminal_appellate_jurisdiction_act_1970.pdf
    • https://cdn.shopify.com/s/files/1/0437/0612/2393/files/puwobedonadugolo.pdf
    • https://cdn.shopify.com/s/files/1/0428/8679/1334/files/aprender_ingles_portugues.pdf
    • https://cdn.shopify.com/s/files/1/0429/2388/4711/files/13990518990.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_off000046ea.bin
09e33427635df911ff93700abd3373d938cf7c43dbc3802172345d9ea391f0d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x46EA 5328 bytes
font_01_sfnt_off000058f4.bin
6b961ba8f56f5dc2a56f3d04808b147e4723c1edff851126838d0093c6de1a4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58F4 9992 bytes

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