Malicious PDF — malware analysis report

Static analysis result for SHA-256 18db8d82fb2dfd45…

MALICIOUS

PDF

40.8 KB Created: 2020-08-05 02:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c75997917f6e806738259c9c59e35872 SHA-1: 347678fedb22a08cc5731692a4c8f022a7ce6572 SHA-256: 18db8d82fb2dfd452cfdbe73909c93ee05e6fd2f2edfc7b8074c6aa9ec978f41
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 external resources, indicating a link farm or redirection attempt. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'ttraff.cc', which is used to obscure the final malicious destination. The ML classifier also strongly flagged this PDF as malicious.

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.cc/pify?keyword=mathematical+algebraic+formulas+pdf
    • http://files.alexandradeviveiros.com/uploads/1/3/2/8/132815045/1709497.pdf
    • http://files.nordicwalkinglondon.com/uploads/1/3/2/7/132741144/ruped-makis.pdf
    • http://kofiwi.fat2fitclinic.com/uploads/1/3/1/6/131606636/vovalofir.pdf
    • http://files.naba-hairstreak.com/uploads/1/3/1/3/131398142/6492625.pdf
    • http://files.chris-palmieri.com/uploads/1/3/0/8/130813582/pojafuseperojoz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2078/7613/files/ana_catalina_emmerick_visiones_y_revelaciones_completas.pdf
    • https://cdn.shopify.com/s/files/1/0434/2353/1175/files/bharathiar_university_distance_education_model_question_paper_2020.pdf
    • https://cdn.shopify.com/s/files/1/0437/5950/1464/files/east_west_bowl_key_and_peele.pdf
    • https://cdn.shopify.com/s/files/1/0435/1436/4059/files/lagofu.pdf
    • https://cdn.shopify.com/s/files/1/0436/4215/9257/files/30537408353.pdf
    • https://cdn.shopify.com/s/files/1/0431/9612/1248/files/25221829717.pdf
    • https://cdn.shopify.com/s/files/1/0427/6423/9014/files/architecture_technical_drawing.pdf
    • https://cdn.shopify.com/s/files/1/0445/8138/8452/files/bootstrap_3_breakpoints.pdf
    • https://cdn.shopify.com/s/files/1/0431/8606/1463/files/bjt_applications.pdf
    • https://cdn.shopify.com/s/files/1/0431/1593/7948/files/42609446035.pdf
    • https://cdn.shopify.com/s/files/1/0435/7668/8799/files/lawatebafikuwudawa.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_off00005e11.bin
9f25e12195088eac314febb3349e2553ed28f0eb765a2a8d80796d0eada04001		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E11 5716 bytes
font_01_sfnt_off00007168.bin
d38b75d3699e82e4dbd51476e46045fbdaa24c9f4ef9bf218107ba3dd74ebf7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7168 10852 bytes

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