Malicious PDF — malware analysis report

Static analysis result for SHA-256 bff03a70eaf5ea7d…

MALICIOUS

PDF

42.4 KB Created: 2020-08-14 15:34:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d13ed8be425104d47cd20e1f51668e6 SHA-1: f30396519e12440c4b33969d7b2580f35ed58b77 SHA-256: bff03a70eaf5ea7d06a99c4651e99dfb148a4f1b403a4edb345cad4df154f451
152 Risk Score

Malware Insights

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

The PDF contains a prominent link disguised as a piano sheet music download, which redirects to a known malicious URL (ttraff.cc). The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this redirection. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded links, as indicated by PDF_SEO_LINK_FARM. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the document's structure and embedded links strongly suggest a lure for phishing or malware distribution.

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=tokio+myers+bloodstream+piano+sheet+music
    • http://files.volnapc.com/uploads/1/3/0/9/130968921/5bf60a.pdf
    • http://pigul.southerntierstarlites.com/uploads/1/3/0/7/130738848/f13c4e7eae10.pdf
    • http://files.southatlantabirths.com/uploads/1/3/0/7/130775503/tabolufugawizidop.pdf
    • http://files.lansingrenegades.org/uploads/1/3/1/3/131380612/1003764.pdf
    • https://cdn.shopify.com/s/files/1/0428/0372/4455/files/javascript_hash_table.pdf
    • https://cdn.shopify.com/s/files/1/0432/1896/0541/files/zolaguvobasedovido.pdf
    • https://cdn.shopify.com/s/files/1/0429/7592/0282/files/ccna_routing_and_switching_complete_study_guide_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0439/7993/1806/files/capacity_requirement_planning_process.pdf
    • https://cdn.shopify.com/s/files/1/0432/2204/0731/files/mufupebotesebofekerowixim.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/42386580717.pdf
    • https://cdn.shopify.com/s/files/1/0429/3305/9737/files/69340548404.pdf
    • https://cdn.shopify.com/s/files/1/0437/2099/9064/files/32326727421.pdf
    • https://cdn.shopify.com/s/files/1/0429/7129/9999/files/isobaric_isochoric_isothermal_and_adiabatic_processes.pdf
    • https://cdn.shopify.com/s/files/1/0433/2604/6362/files/atriplex_canescens.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_off00005000.bin
465b36baedcafdc42fd109499ec1198412a93562f18abcf06709b122ad83f92f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5000 5568 bytes
font_01_sfnt_off000062b9.bin
c507e07db4f80e1143e8abe4df315075509648ab101bbcb557a60f19c33472e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62B9 10744 bytes
font_02_sfnt_off00008764.bin
15a68420f1c377824b8c1fd571ac7c30556db1b4bc05006bf44ec3f6c6c83208		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8764 16120 bytes

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